[PATCH] git-send-email.perl - Fix 550 EHLO argument does not match calling host

[Jari Aalto <jari.aalto@cante.net>]

Add new function maildomain() which returns FQDN for use in
send_message(). The value is passed to Net::SMTP HELO/EHLO handshake.

The default value in Net::SMTP may not get through:

  Net::SMTP=GLOB(0x267ec28)>>> EHLO localhost.localdomain
  Net::SMTP=GLOB(0x267ec28)<<< 550 EHLO argument does not match calling host

whereas using the FQDN, the result is:

  Net::SMTP=GLOB(0x15b8e80)>>> EHLO host.example.com
  Net::SMTP=GLOB(0x15b8e80)<<< 250-host.example.com Hello host.example.com [192.168.1.7]

Signed-off-by: Jari Aalto <jari.aalto@cante.net>
---
 git-send-email.perl |   52 +++++++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 50 insertions(+), 2 deletions(-)


This patch is applied *after* the other 2 sent in this thread.

diff --git a/git-send-email.perl b/git-send-email.perl
index 6af7bd3..2eabed6 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -834,6 +834,46 @@ sub sanitize_address
 
 }
 
+# Returns the local Fully Qualified Domain Name (FQDN) if available,
+# If this is not given to EHLO, the receiving SMTP may deny connection
+# Here is an example of Net::SMTP without explicit Helo: it
+# uses by default "localhost.localdomain"
+#
+# Net::SMTP=GLOB(0x267ec28)>>> EHLO localhost.localdomain
+# Net::SMTP=GLOB(0x267ec28)<<< 550 EHLO argument does not match calling host
+
+sub maildomain ()
+{
+	my $maildomain;
+	eval "use Net::Domain";
+
+	unless ( $@ ) {
+		for my $host ( qw(mailhost localhost) ) {
+			my $smtp = Net::SMTP->new($host);
+			if (defined $smtp) {
+				my $domain = $smtp->domain;
+				$smtp->quit;
+
+				$maildomain = $domain
+					unless $^O eq 'darwin' && $domain =~ /\.local$/;
+
+				last if $maildomain;
+			}
+		}
+	}
+
+	unless ($maildomain) {
+		eval "use Net::Domain";
+		unless ( $@ ) {
+		    my $domain = Net::Domain::domainname();
+		    $maildomain = $domain
+			    unless $^O eq 'darwin' && $domain =~ /\.local$/;
+		}
+	}
+
+	$maildomain;
+}
+
 # Returns 1 if the message was sent, and 0 otherwise.
 # In actuality, the whole program dies when there
 # is an error sending a message.
@@ -917,6 +957,8 @@ X-Mailer: git-send-email $gitversion
 		}
 	}
 
+	my $maildomain;
+
 	if ($dry_run) {
 		# We don't want to send the email.
 	} elsif ($smtp_server =~ m#^/#) {
@@ -936,13 +978,18 @@ X-Mailer: git-send-email $gitversion
 		if ($smtp_encryption eq 'ssl') {
 			$smtp_server_port ||= 465; # ssmtp
 			require Net::SMTP::SSL;
-			$smtp ||= Net::SMTP::SSL->new($smtp_server, Port => $smtp_server_port);
+			$maildomain = maildomain() || "localhost.localdomain";
+			$smtp ||= Net::SMTP::SSL->new($smtp_server,
+						      Hello => $maildomain,
+						      Port => $smtp_server_port);
 		}
 		else {
 			require Net::SMTP;
+			$maildomain = maildomain() || "localhost.localdomain";
 			$smtp ||= Net::SMTP->new((defined $smtp_server_port)
 						 ? "$smtp_server:$smtp_server_port"
 						 : $smtp_server,
+						 Hello => $maildomain,
 						 Debug => $debug_net_smtp);
 			if ($smtp_encryption eq 'tls' && $smtp) {
 				require Net::SMTP::SSL;
@@ -962,9 +1009,10 @@ X-Mailer: git-send-email $gitversion
 		}
 
 		if (!$smtp) {
-			die "Unable to initialize SMTP properly. Check config. ",
+			die "Unable to initialize SMTP properly. Check config and use --smtp-debug. ",
 			    "VALUES: server=$smtp_server ",
 			    "encryption=$smtp_encryption ",
+			    "maildomain=$maildomain",
 			    defined $smtp_server_port ? "port=$smtp_server_port" : "";
 		}
 
-- 
1.7.0