The point is that the connection attempt does show up in the logs, but beyond the connection being initiated, nothing more happens. I'm experiencing the same issues when I set SSL => 0 (this is still possible, because my MTA is configured so that TLS doesn't have to be used for incoming mails) so it's not a problem with SSL/TLS, though. As far as the form mailer is concerned, it is supposed to transmit its data on port 25. No idea why it stopped working after upgrading the distro...

However, I'm going to give the Debug approach a shot.

EDIT: It appears that STARTTLS is required, but the method starttls() seems to be missing in my Net::SMTP...

Anyway, here's what the script dumped with Debug enabled:

Sanity check of recipient address...
<recipient address displayed here>
Net::SMTP>>> Net::SMTP(2.31)
Net::SMTP>>>   Net::Cmd(2.29)
Net::SMTP>>>     Exporter(5.68)
Net::SMTP>>>   IO::Socket::INET(1.33)
Net::SMTP>>>     IO::Socket(1.36)
Net::SMTP>>>       IO::Handle(1.34)
Net::SMTP=GLOB(0x1c9d748)<<< 220 <domain name displayed here> mail. Al
+l spam is reported. ESMTP
Net::SMTP=GLOB(0x1c9d748)>>> EHLO <domain displayed here>
Net::SMTP=GLOB(0x1c9d748)<<< 250-<server name displayed here>
Net::SMTP=GLOB(0x1c9d748)<<< 250-PIPELINING
Net::SMTP=GLOB(0x1c9d748)<<< 250-SIZE 26214400
Net::SMTP=GLOB(0x1c9d748)<<< 250-ETRN
Net::SMTP=GLOB(0x1c9d748)<<< 250-STARTTLS
Net::SMTP=GLOB(0x1c9d748)<<< 250-ENHANCEDSTATUSCODES
Net::SMTP=GLOB(0x1c9d748)<<< 250-8BITMIME
Net::SMTP=GLOB(0x1c9d748)<<< 250 DSN
Issuing STARTTLS...
Net::SMTP=GLOB(0x1c9d748)>>> QUIT
Net::SMTP=GLOB(0x1c9d748)<<< 221 2.0.0 Bye
The transaction failed: Can't locate object method "starttls" via pack
+age "Net::SMTP" at /srv/www1-ssl/cgi-lib/sendmail.pm line 74.

Transmission failure

[download]

UPDATE: I had to update both Net::SMTP and IO::Socket::SSL from CPAN. After the update STARTTLS could be issued, but that caused another bunch of problems to appear: 

Sanity check of recipient address...
<recipient address shown here>
Net::SMTP>>> Net::SMTP(3.10)
Net::SMTP>>>   Net::Cmd(3.10)
Net::SMTP>>>     Exporter(5.68)
Net::SMTP>>>   IO::Socket::IP(0.37)
Net::SMTP>>>     IO::Socket(1.36)
Net::SMTP>>>       IO::Handle(1.34)
Net::SMTP=GLOB(0x20461c8)<<< 220 <domain shown here> mail. All spam is
+ reported. ESMTP
Net::SMTP=GLOB(0x20461c8)>>> EHLO <domain shown here>
Net::SMTP=GLOB(0x20461c8)<<< 250-<server address shown here>
Net::SMTP=GLOB(0x20461c8)<<< 250-PIPELINING
Net::SMTP=GLOB(0x20461c8)<<< 250-SIZE 26214400
Net::SMTP=GLOB(0x20461c8)<<< 250-ETRN
Net::SMTP=GLOB(0x20461c8)<<< 250-STARTTLS
Net::SMTP=GLOB(0x20461c8)<<< 250-ENHANCEDSTATUSCODES
Net::SMTP=GLOB(0x20461c8)<<< 250-8BITMIME
Net::SMTP=GLOB(0x20461c8)<<< 250 DSN
Issuing STARTTLS...
Net::SMTP=GLOB(0x20461c8)>>> STARTTLS
Net::SMTP=GLOB(0x20461c8)<<< 220 2.0.0 Ready to start TLS
Sending MAIL FROM...
Net::SMTP=GLOB(0x20461c8)>>> MAIL FROM:<sender address shown here>
Net::SMTP: Net::Cmd::getline(): unexpected EOF on command channel:  at
+ /srv/www1-ssl/cgi-lib/sendmail.pm line 76.
Attempting RCPT TO...
Net::SMTP: Net::Cmd::_is_closed(): unexpected EOF on command channel: 
+ at /srv/www1-ssl/cgi-lib/sendmail.pm line 78.
Net::SMTP: Net::Cmd::_is_closed(): unexpected EOF on command channel: 
+ at /srv/www1-ssl/cgi-lib/sendmail.pm line 78.
Net::SMTP: Net::Cmd::_is_closed(): unexpected EOF on command channel: 
+ at /srv/www1-ssl/cgi-lib/sendmail.pm line 102.
Net::SMTP: Net::Cmd::_is_closed(): unexpected EOF on command channel: 
+ at /srv/www1-ssl/cgi-lib/sendmail.pm line 102.
The transaction failed: Connection refused
Transmission failure

[download]

In reply to Re^2: Net::SMTP - Connection to local MTA refused by Robidu
in thread Net::SMTP - Connection to local MTA refused by Robidu

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