standardize usage info string format
[gitweb.git] / git-send-email.perl
index 70cad15ec46d0ed32f3b97c792e9d975ece53fd8..3092ab356c765cd593d2a988d020665c8b626ea1 100755 (executable)
@@ -54,10 +54,12 @@ sub usage {
     --[no-]bcc              <str>  * Email Bcc:
     --subject               <str>  * Email "Subject:"
     --in-reply-to           <str>  * Email "In-Reply-To:"
-    --annotate                     * Review each patch that will be sent in an editor.
+    --[no-]xmailer                 * Add "X-Mailer:" header (default).
+    --[no-]annotate                * Review each patch that will be sent in an editor.
     --compose                      * Open an editor for introduction.
     --compose-encoding      <str>  * Encoding to assume for introduction.
     --8bit-encoding         <str>  * Encoding to assume 8bit mails if undeclared
+    --transfer-encoding     <str>  * Transfer encoding to use (quoted-printable, 8bit, base64)
 
   Sending:
     --envelope-sender       <str>  * Email envelope sender.
@@ -69,6 +71,9 @@ sub usage {
     --smtp-pass             <str>  * Password for SMTP-AUTH; not necessary.
     --smtp-encryption       <str>  * tls or ssl; anything else disables.
     --smtp-ssl                     * Deprecated. Use '--smtp-encryption ssl'.
+    --smtp-ssl-cert-path    <str>  * Path to ca-certificates (either directory or file).
+                                     Pass an empty string to disable certificate
+                                     verification.
     --smtp-domain           <str>  * The domain name sent to HELO/EHLO handshake
     --smtp-debug            <0|1>  * Disable, enable Net::SMTP debug.
 
@@ -77,6 +82,8 @@ sub usage {
     --to-cmd                <str>  * Email To: via `<str> \$patch_path`
     --cc-cmd                <str>  * Email Cc: via `<str> \$patch_path`
     --suppress-cc           <str>  * author, self, sob, cc, cccmd, body, bodycc, all.
+    --[no-]cc-cover                * Email Cc: addresses in the cover letter.
+    --[no-]to-cover                * Email To: addresses in the cover letter.
     --[no-]signed-off-by-cc        * Send to Signed-off-by: addresses. Default on.
     --[no-]suppress-from           * Send to self. Default off.
     --[no-]chain-reply-to          * Chain In-Reply-To: fields. Default off.
@@ -140,10 +147,15 @@ sub format_2822_time {
 my $smtp;
 my $auth;
 
+# Regexes for RFC 2047 productions.
+my $re_token = qr/[^][()<>@,;:\\"\/?.= \000-\037\177-\377]+/;
+my $re_encoded_text = qr/[^? \000-\037\177-\377]+/;
+my $re_encoded_word = qr/=\?($re_token)\?($re_token)\?($re_encoded_text)\?=/;
+
 # Variables we fill in automatically, or via prompting:
 my (@to,$no_to,@initial_to,@cc,$no_cc,@initial_cc,@bcclist,$no_bcc,@xh,
        $initial_reply_to,$initial_subject,@files,
-       $author,$sender,$smtp_authpass,$annotate,$compose,$time);
+       $author,$sender,$smtp_authpass,$annotate,$use_xmailer,$compose,$time);
 
 my $envelope_sender;
 
@@ -192,27 +204,31 @@ sub do_edit {
 
 # Variables with corresponding config settings
 my ($thread, $chain_reply_to, $suppress_from, $signed_off_by_cc);
+my ($cover_cc, $cover_to);
 my ($to_cmd, $cc_cmd);
 my ($smtp_server, $smtp_server_port, @smtp_server_options);
-my ($smtp_authuser, $smtp_encryption);
+my ($smtp_authuser, $smtp_encryption, $smtp_ssl_cert_path);
 my ($identity, $aliasfiletype, @alias_files, $smtp_domain);
 my ($validate, $confirm);
 my (@suppress_cc);
 my ($auto_8bit_encoding);
 my ($compose_encoding);
+my ($target_xfer_encoding);
 
 my ($debug_net_smtp) = 0;              # Net::SMTP, see send_message()
 
-my $not_set_by_user = "true but not set by the user";
-
 my %config_bool_settings = (
     "thread" => [\$thread, 1],
-    "chainreplyto" => [\$chain_reply_to, $not_set_by_user],
+    "chainreplyto" => [\$chain_reply_to, 0],
     "suppressfrom" => [\$suppress_from, undef],
     "signedoffbycc" => [\$signed_off_by_cc, undef],
+    "cccover" => [\$cover_cc, undef],
+    "tocover" => [\$cover_to, undef],
     "signedoffcc" => [\$signed_off_by_cc, undef],      # Deprecated
     "validate" => [\$validate, 1],
-    "multiedit" => [\$multiedit, undef]
+    "multiedit" => [\$multiedit, undef],
+    "annotate" => [\$annotate, undef],
+    "xmailer" => [\$use_xmailer, 1]
 );
 
 my %config_settings = (
@@ -221,6 +237,7 @@ sub do_edit {
     "smtpserveroption" => \@smtp_server_options,
     "smtpuser" => \$smtp_authuser,
     "smtppass" => \$smtp_authpass,
+    "smtpsslcertpath" => \$smtp_ssl_cert_path,
     "smtpdomain" => \$smtp_domain,
     "to" => \@initial_to,
     "tocmd" => \$to_cmd,
@@ -234,25 +251,13 @@ sub do_edit {
     "from" => \$sender,
     "assume8bitencoding" => \$auto_8bit_encoding,
     "composeencoding" => \$compose_encoding,
+    "transferencoding" => \$target_xfer_encoding,
 );
 
 my %config_path_settings = (
     "aliasesfile" => \@alias_files,
 );
 
-# Help users prepare for 1.7.0
-sub chain_reply_to {
-       if (defined $chain_reply_to &&
-           $chain_reply_to eq $not_set_by_user) {
-               print STDERR
-                   "In git 1.7.0, the default has changed to --no-chain-reply-to\n" .
-                   "Set sendemail.chainreplyto configuration variable to true if\n" .
-                   "you want to keep --chain-reply-to as your default.\n";
-               $chain_reply_to = 0;
-       }
-       return $chain_reply_to;
-}
-
 # Handle Uncouth Termination
 sub signal_handler {
 
@@ -301,25 +306,30 @@ sub signal_handler {
                    "smtp-pass:s" => \$smtp_authpass,
                    "smtp-ssl" => sub { $smtp_encryption = 'ssl' },
                    "smtp-encryption=s" => \$smtp_encryption,
+                   "smtp-ssl-cert-path=s" => \$smtp_ssl_cert_path,
                    "smtp-debug:i" => \$debug_net_smtp,
                    "smtp-domain:s" => \$smtp_domain,
                    "identity=s" => \$identity,
-                   "annotate" => \$annotate,
+                   "annotate!" => \$annotate,
                    "compose" => \$compose,
                    "quiet" => \$quiet,
                    "cc-cmd=s" => \$cc_cmd,
                    "suppress-from!" => \$suppress_from,
                    "suppress-cc=s" => \@suppress_cc,
                    "signed-off-cc|signed-off-by-cc!" => \$signed_off_by_cc,
+                   "cc-cover|cc-cover!" => \$cover_cc,
+                   "to-cover|to-cover!" => \$cover_to,
                    "confirm=s" => \$confirm,
                    "dry-run" => \$dry_run,
                    "envelope-sender=s" => \$envelope_sender,
                    "thread!" => \$thread,
                    "validate!" => \$validate,
+                   "transfer-encoding=s" => \$target_xfer_encoding,
                    "format-patch!" => \$format_patch,
                    "8bit-encoding=s" => \$auto_8bit_encoding,
                    "compose-encoding=s" => \$compose_encoding,
                    "force" => \$force,
+                   "xmailer!" => \$use_xmailer,
         );
 
 usage() if $help;
@@ -759,6 +769,11 @@ sub file_declares_8bit_cte {
        $sender = $repoauthor || $repocommitter || '';
 }
 
+# $sender could be an already sanitized address
+# (e.g. sendemail.from could be manually sanitized by user).
+# But it's a no-op to run sanitize_address on an already sanitized address.
+$sender = sanitize_address($sender);
+
 my $prompting = 0;
 if (!@initial_to && !defined $to_cmd) {
        my $to = ask("Who should the emails be sent to (if any)? ",
@@ -910,15 +925,26 @@ sub make_message_id {
 
 sub unquote_rfc2047 {
        local ($_) = @_;
-       my $encoding;
-       s{=\?([^?]+)\?q\?(.*?)\?=}{
-               $encoding = $1;
-               my $e = $2;
-               $e =~ s/_/ /g;
-               $e =~ s/=([0-9A-F]{2})/chr(hex($1))/eg;
-               $e;
+       my $charset;
+       my $sep = qr/[ \t]+/;
+       s{$re_encoded_word(?:$sep$re_encoded_word)*}{
+               my @words = split $sep, $&;
+               foreach (@words) {
+                       m/$re_encoded_word/;
+                       $charset = $1;
+                       my $encoding = $2;
+                       my $text = $3;
+                       if ($encoding eq 'q' || $encoding eq 'Q') {
+                               $_ = $text;
+                               s/_/ /g;
+                               s/=([0-9A-F]{2})/chr(hex($1))/egi;
+                       } else {
+                               # other encodings not supported yet
+                       }
+               }
+               join '', @words;
        }eg;
-       return wantarray ? ($_, $encoding) : $_;
+       return wantarray ? ($_, $charset) : $_;
 }
 
 sub quote_rfc2047 {
@@ -931,10 +957,8 @@ sub quote_rfc2047 {
 
 sub is_rfc2047_quoted {
        my $s = shift;
-       my $token = qr/[^][()<>@,;:"\/?.= \000-\037\177-\377]+/;
-       my $encoded_text = qr/[!->@-~]+/;
        length($s) <= 75 &&
-       $s =~ m/^(?:"[[:ascii:]]*"|=\?$token\?$token\?$encoded_text\?=)$/o;
+       $s =~ m/^(?:"[[:ascii:]]*"|$re_encoded_word)$/o;
 }
 
 sub subject_needs_rfc2047_quoting {
@@ -1047,6 +1071,88 @@ sub maildomain {
        return maildomain_net() || maildomain_mta() || 'localhost.localdomain';
 }
 
+sub smtp_host_string {
+       if (defined $smtp_server_port) {
+               return "$smtp_server:$smtp_server_port";
+       } else {
+               return $smtp_server;
+       }
+}
+
+# Returns 1 if authentication succeeded or was not necessary
+# (smtp_user was not specified), and 0 otherwise.
+
+sub smtp_auth_maybe {
+       if (!defined $smtp_authuser || $auth) {
+               return 1;
+       }
+
+       # Workaround AUTH PLAIN/LOGIN interaction defect
+       # with Authen::SASL::Cyrus
+       eval {
+               require Authen::SASL;
+               Authen::SASL->import(qw(Perl));
+       };
+
+       # TODO: Authentication may fail not because credentials were
+       # invalid but due to other reasons, in which we should not
+       # reject credentials.
+       $auth = Git::credential({
+               'protocol' => 'smtp',
+               'host' => smtp_host_string(),
+               'username' => $smtp_authuser,
+               # if there's no password, "git credential fill" will
+               # give us one, otherwise it'll just pass this one.
+               'password' => $smtp_authpass
+       }, sub {
+               my $cred = shift;
+               return !!$smtp->auth($cred->{'username'}, $cred->{'password'});
+       });
+
+       return $auth;
+}
+
+sub ssl_verify_params {
+       eval {
+               require IO::Socket::SSL;
+               IO::Socket::SSL->import(qw/SSL_VERIFY_PEER SSL_VERIFY_NONE/);
+       };
+       if ($@) {
+               print STDERR "Not using SSL_VERIFY_PEER due to out-of-date IO::Socket::SSL.\n";
+               return;
+       }
+
+       if (!defined $smtp_ssl_cert_path) {
+               # use the OpenSSL defaults
+               return (SSL_verify_mode => SSL_VERIFY_PEER());
+       }
+
+       if ($smtp_ssl_cert_path eq "") {
+               return (SSL_verify_mode => SSL_VERIFY_NONE());
+       } elsif (-d $smtp_ssl_cert_path) {
+               return (SSL_verify_mode => SSL_VERIFY_PEER(),
+                       SSL_ca_path => $smtp_ssl_cert_path);
+       } elsif (-f $smtp_ssl_cert_path) {
+               return (SSL_verify_mode => SSL_VERIFY_PEER(),
+                       SSL_ca_file => $smtp_ssl_cert_path);
+       } else {
+               print STDERR "Not using SSL_VERIFY_PEER because the CA path does not exist.\n";
+               return (SSL_verify_mode => SSL_VERIFY_NONE());
+       }
+}
+
+sub file_name_is_absolute {
+       my ($path) = @_;
+
+       # msys does not grok DOS drive-prefixes
+       if ($^O eq 'msys') {
+               return ($path =~ m#^/# || $path =~ m#^[a-zA-Z]\:#)
+       }
+
+       require File::Spec::Functions;
+       return File::Spec::Functions::file_name_is_absolute($path);
+}
+
 # Returns 1 if the message was sent, and 0 otherwise.
 # In actuality, the whole program dies when there
 # is an error sending a message.
@@ -1071,16 +1177,17 @@ sub send_message {
        if ($cc ne '') {
                $ccline = "\nCc: $cc";
        }
-       my $sanitized_sender = sanitize_address($sender);
        make_message_id() unless defined($message_id);
 
-       my $header = "From: $sanitized_sender
+       my $header = "From: $sender
 To: $to${ccline}
 Subject: $subject
 Date: $date
 Message-Id: $message_id
-X-Mailer: git-send-email $gitversion
 ";
+       if ($use_xmailer) {
+               $header .= "X-Mailer: git-send-email $gitversion\n";
+       }
        if ($reply_to) {
 
                $header .= "In-Reply-To: $reply_to\n";
@@ -1091,7 +1198,7 @@ sub send_message {
        }
 
        my @sendmail_parameters = ('-i', @recipients);
-       my $raw_from = $sanitized_sender;
+       my $raw_from = $sender;
        if (defined $envelope_sender && $envelope_sender ne "auto") {
                $raw_from = $envelope_sender;
        }
@@ -1132,7 +1239,7 @@ sub send_message {
 
        if ($dry_run) {
                # We don't want to send the email.
-       } elsif ($smtp_server =~ m#^/#) {
+       } elsif (file_name_is_absolute($smtp_server)) {
                my $pid = open my $sm, '|-';
                defined $pid or die $!;
                if (!$pid) {
@@ -1150,25 +1257,31 @@ sub send_message {
                        $smtp_server_port ||= 465; # ssmtp
                        require Net::SMTP::SSL;
                        $smtp_domain ||= maildomain();
+                       require IO::Socket::SSL;
+                       # Net::SMTP::SSL->new() does not forward any SSL options
+                       IO::Socket::SSL::set_client_defaults(
+                               ssl_verify_params());
                        $smtp ||= Net::SMTP::SSL->new($smtp_server,
                                                      Hello => $smtp_domain,
-                                                     Port => $smtp_server_port);
+                                                     Port => $smtp_server_port,
+                                                     Debug => $debug_net_smtp);
                }
                else {
                        require Net::SMTP;
                        $smtp_domain ||= maildomain();
-                       $smtp ||= Net::SMTP->new((defined $smtp_server_port)
-                                                ? "$smtp_server:$smtp_server_port"
-                                                : $smtp_server,
+                       $smtp_server_port ||= 25;
+                       $smtp ||= Net::SMTP->new($smtp_server,
                                                 Hello => $smtp_domain,
-                                                Debug => $debug_net_smtp);
+                                                Debug => $debug_net_smtp,
+                                                Port => $smtp_server_port);
                        if ($smtp_encryption eq 'tls' && $smtp) {
                                require Net::SMTP::SSL;
                                $smtp->command('STARTTLS');
                                $smtp->response();
                                if ($smtp->code == 220) {
-                                       $smtp = Net::SMTP::SSL->start_SSL($smtp)
-                                               or die "STARTTLS failed! ".$smtp->message;
+                                       $smtp = Net::SMTP::SSL->start_SSL($smtp,
+                                                                         ssl_verify_params())
+                                               or die "STARTTLS failed! ".IO::Socket::SSL::errstr();
                                        $smtp_encryption = '';
                                        # Send EHLO again to receive fresh
                                        # supported commands
@@ -1187,31 +1300,7 @@ sub send_message {
                            defined $smtp_server_port ? " port=$smtp_server_port" : "";
                }
 
-               if (defined $smtp_authuser) {
-                       # Workaround AUTH PLAIN/LOGIN interaction defect
-                       # with Authen::SASL::Cyrus
-                       eval {
-                               require Authen::SASL;
-                               Authen::SASL->import(qw(Perl));
-                       };
-
-                       if (!defined $smtp_authpass) {
-
-                               system "stty -echo";
-
-                               do {
-                                       print "Password: ";
-                                       $_ = <STDIN>;
-                                       print "\n";
-                               } while (!defined $_);
-
-                               chomp($smtp_authpass = $_);
-
-                               system "stty echo";
-                       }
-
-                       $auth ||= $smtp->auth( $smtp_authuser, $smtp_authpass ) or die $smtp->message;
-               }
+               smtp_auth_maybe or die $smtp->message;
 
                $smtp->mail( $raw_from ) or die $smtp->message;
                $smtp->to( @recipients ) or die $smtp->message;
@@ -1224,7 +1313,7 @@ sub send_message {
                printf (($dry_run ? "Dry-" : "")."Sent %s\n", $subject);
        } else {
                print (($dry_run ? "Dry-" : "")."OK. Log says:\n");
-               if ($smtp_server !~ m#^/#) {
+               if (!file_name_is_absolute($smtp_server)) {
                        print "Server: $smtp_server\n";
                        print "MAIL FROM:<$raw_from>\n";
                        foreach my $entry (@recipients) {
@@ -1254,9 +1343,12 @@ sub send_message {
        open my $fh, "<", $t or die "can't open file $t";
 
        my $author = undef;
+       my $sauthor = undef;
        my $author_encoding;
        my $has_content_type;
        my $body_encoding;
+       my $xfer_encoding;
+       my $has_mime_version;
        @to = ();
        @cc = ();
        @xh = ();
@@ -1292,8 +1384,9 @@ sub send_message {
                        }
                        elsif (/^From:\s+(.*)$/i) {
                                ($author, $author_encoding) = unquote_rfc2047($1);
+                               $sauthor = sanitize_address($author);
                                next if $suppress_cc{'author'};
-                               next if $suppress_cc{'self'} and $author eq $sender;
+                               next if $suppress_cc{'self'} and $sauthor eq $sender;
                                printf("(mbox) Adding cc: %s from line '%s'\n",
                                        $1, $_) unless $quiet;
                                push @cc, $1;
@@ -1307,7 +1400,9 @@ sub send_message {
                        }
                        elsif (/^Cc:\s+(.*)$/i) {
                                foreach my $addr (parse_address_line($1)) {
-                                       if (unquote_rfc2047($addr) eq $sender) {
+                                       my $qaddr = unquote_rfc2047($addr);
+                                       my $saddr = sanitize_address($qaddr);
+                                       if ($saddr eq $sender) {
                                                next if ($suppress_cc{'self'});
                                        } else {
                                                next if ($suppress_cc{'cc'});
@@ -1324,9 +1419,16 @@ sub send_message {
                                }
                                push @xh, $_;
                        }
+                       elsif (/^MIME-Version/i) {
+                               $has_mime_version = 1;
+                               push @xh, $_;
+                       }
                        elsif (/^Message-Id: (.*)/i) {
                                $message_id = $1;
                        }
+                       elsif (/^Content-Transfer-Encoding: (.*)/i) {
+                               $xfer_encoding = $1 if not defined $xfer_encoding;
+                       }
                        elsif (!/^Date:\s/i && /^[-A-Za-z]+:\s+\S/) {
                                push @xh, $_;
                        }
@@ -1354,7 +1456,8 @@ sub send_message {
                        chomp;
                        my ($what, $c) = ($1, $2);
                        chomp $c;
-                       if ($c eq $sender) {
+                       my $sc = sanitize_address($c);
+                       if ($sc eq $sender) {
                                next if ($suppress_cc{'self'});
                        } else {
                                next if $suppress_cc{'sob'} and $what =~ /Signed-off-by/i;
@@ -1373,10 +1476,9 @@ sub send_message {
                if defined $cc_cmd && !$suppress_cc{'cccmd'};
 
        if ($broken_encoding{$t} && !$has_content_type) {
+               $xfer_encoding = '8bit' if not defined $xfer_encoding;
                $has_content_type = 1;
-               push @xh, "MIME-Version: 1.0",
-                       "Content-Type: text/plain; charset=$auto_8bit_encoding",
-                       "Content-Transfer-Encoding: 8bit";
+               push @xh, "Content-Type: text/plain; charset=$auto_8bit_encoding";
                $body_encoding = $auto_8bit_encoding;
        }
 
@@ -1384,7 +1486,7 @@ sub send_message {
                $subject = quote_subject($subject, $auto_8bit_encoding);
        }
 
-       if (defined $author and $author ne $sender) {
+       if (defined $sauthor and $sauthor ne $sender) {
                $message = "From: $author\n\n$message";
                if (defined $author_encoding) {
                        if ($has_content_type) {
@@ -1396,14 +1498,25 @@ sub send_message {
                                }
                        }
                        else {
+                               $xfer_encoding = '8bit' if not defined $xfer_encoding;
                                $has_content_type = 1;
                                push @xh,
-                                 'MIME-Version: 1.0',
-                                 "Content-Type: text/plain; charset=$author_encoding",
-                                 'Content-Transfer-Encoding: 8bit';
+                                 "Content-Type: text/plain; charset=$author_encoding";
                        }
                }
        }
+       if (defined $target_xfer_encoding) {
+               $xfer_encoding = '8bit' if not defined $xfer_encoding;
+               $message = apply_transfer_encoding(
+                       $message, $xfer_encoding, $target_xfer_encoding);
+               $xfer_encoding = $target_xfer_encoding;
+       }
+       if (defined $xfer_encoding) {
+               push @xh, "Content-Transfer-Encoding: $xfer_encoding";
+       }
+       if (defined $xfer_encoding or $has_content_type) {
+               unshift @xh, 'MIME-Version: 1.0' unless $has_mime_version;
+       }
 
        $needs_confirm = (
                $confirm eq "always" or
@@ -1417,11 +1530,20 @@ sub send_message {
        @to = (@initial_to, @to);
        @cc = (@initial_cc, @cc);
 
+       if ($message_num == 1) {
+               if (defined $cover_cc and $cover_cc) {
+                       @initial_cc = @cc;
+               }
+               if (defined $cover_to and $cover_to) {
+                       @initial_to = @to;
+               }
+       }
+
        my $message_was_sent = send_message();
 
        # set up for the next message
        if ($thread && $message_was_sent &&
-               (chain_reply_to() || !defined $reply_to || length($reply_to) == 0 ||
+               ($chain_reply_to || !defined $reply_to || length($reply_to) == 0 ||
                $message_num == 1)) {
                $reply_to = $message_id;
                if (length $references > 0) {
@@ -1438,7 +1560,6 @@ sub send_message {
 sub recipients_cmd {
        my ($prefix, $what, $cmd, $file) = @_;
 
-       my $sanitized_sender = sanitize_address($sender);
        my @addresses = ();
        open my $fh, "-|", "$cmd \Q$file\E"
            or die "($prefix) Could not execute '$cmd'";
@@ -1446,7 +1567,7 @@ sub recipients_cmd {
                $address =~ s/^\s*//g;
                $address =~ s/\s*$//g;
                $address = sanitize_address($address);
-               next if ($address eq $sanitized_sender and $suppress_from);
+               next if ($address eq $sender and $suppress_cc{'self'});
                push @addresses, $address;
                printf("($prefix) Adding %s: %s from: '%s'\n",
                       $what, $address, $cmd) unless $quiet;
@@ -1464,6 +1585,32 @@ sub cleanup_compose_files {
 
 $smtp->quit if $smtp;
 
+sub apply_transfer_encoding {
+       my $message = shift;
+       my $from = shift;
+       my $to = shift;
+
+       return $message if ($from eq $to and $from ne '7bit');
+
+       require MIME::QuotedPrint;
+       require MIME::Base64;
+
+       $message = MIME::QuotedPrint::decode($message)
+               if ($from eq 'quoted-printable');
+       $message = MIME::Base64::decode($message)
+               if ($from eq 'base64');
+
+       die "cannot send message as 7bit"
+               if ($to eq '7bit' and $message =~ /[^[:ascii:]]/);
+       return $message
+               if ($to eq '7bit' or $to eq '8bit');
+       return MIME::QuotedPrint::encode($message, "\n", 0)
+               if ($to eq 'quoted-printable');
+       return MIME::Base64::encode($message, "\n")
+               if ($to eq 'base64');
+       die "invalid transfer encoding";
+}
+
 sub unique_email_list {
        my %seen;
        my @emails;