send-email: Net::SMTP::SSL is obsolete, use only when necessary

Net::SMTP itself can do the necessary SSL and STARTTLS bits just fine
since version 1.28, and Net::SMTP::SSL is now deprecated. Since 1.28
isn't that old yet, keep the old code in place and use it when
necessary.

While we're in the area, mark some messages for translation that were
not yet marked as such.

Signed-off-by: Dennis Kaarsemaker <dennis@kaarsemaker.net>
Reviewed-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-send-email.perl

@@ -1353,10 +1353,12 @@ EOF
 			die __("The required SMTP server is not properly defined.")
 		}
 
+		require Net::SMTP;
+		my $use_net_smtp_ssl = version->parse($Net::SMTP::VERSION) < version->parse("1.28");
+		$smtp_domain ||= maildomain();
+
 		if ($smtp_encryption eq 'ssl') {
 			$smtp_server_port ||= 465; # ssmtp
-			require Net::SMTP::SSL;
-			$smtp_domain ||= maildomain();
 			require IO::Socket::SSL;
 
 			# Suppress "variable accessed once" warning.
@@ -1368,34 +1370,48 @@ EOF
 			# Net::SMTP::SSL->new() does not forward any SSL options
 			IO::Socket::SSL::set_client_defaults(
 				ssl_verify_params());
+
+			if ($use_net_smtp_ssl) {
+				require Net::SMTP::SSL;
 				$smtp ||= Net::SMTP::SSL->new($smtp_server,
 							      Hello => $smtp_domain,
 							      Port => $smtp_server_port,
 							      Debug => $debug_net_smtp);
 			}
 			else {
-			require Net::SMTP;
-			$smtp_domain ||= maildomain();
+				$smtp ||= Net::SMTP->new($smtp_server,
+							 Hello => $smtp_domain,
+							 Port => $smtp_server_port,
+							 Debug => $debug_net_smtp,
+							 SSL => 1);
+			}
+		}
+		else {
 			$smtp_server_port ||= 25;
 			$smtp ||= Net::SMTP->new($smtp_server,
 						 Hello => $smtp_domain,
 						 Debug => $debug_net_smtp,
 						 Port => $smtp_server_port);
 			if ($smtp_encryption eq 'tls' && $smtp) {
-				require Net::SMTP::SSL;
+				if ($use_net_smtp_ssl) {
 					$smtp->command('STARTTLS');
 					$smtp->response();
-				if ($smtp->code == 220) {
+					if ($smtp->code != 220) {
+						die sprintf(__("Server does not support STARTTLS! %s"), $smtp->message);
+					}
+					require Net::SMTP::SSL;
 					$smtp = Net::SMTP::SSL->start_SSL($smtp,
 									  ssl_verify_params())
-						or die "STARTTLS failed! ".IO::Socket::SSL::errstr();
+						or die sprintf(__("STARTTLS failed! %s"), IO::Socket::SSL::errstr());
+				}
+				else {
+					$smtp->starttls(ssl_verify_params())
+						or die sprintf(__("STARTTLS failed! %s"), IO::Socket::SSL::errstr());
+				}
 				$smtp_encryption = '';
 				# Send EHLO again to receive fresh
 				# supported commands
 				$smtp->hello($smtp_domain);
-				} else {
-					die sprintf(__("Server does not support STARTTLS! %s"), $smtp->message);
-				}
 			}
 		}