I am using Postfix MTA on a Linux server to relay mail through 'relay.plus.net' This has been working fine. Today however, a colleague has had two emails bounced back. One with a '550 Sender verify failed' message, the other with a '553 Unable to verify address' message.
Other emails are going out no problem. Are ntlworld and tiscali blocking email from Plusnet? Help!!
The bounce details follow (I have obscured the email addresses for security reasons) :
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This is the Postfix program at host mail.xxxxxxx.org.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to <postmaster>
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The Postfix program
<xxxxxx@ntlworld.com>: host relay.plus.net[212.159.11.46] said:
550-Verification failed for <xxxxxxx@xxxxxxx.org>
550-Unrouteable address 550 Sender verify failed (in reply to RCPT TO
command)
Reporting-MTA: dns; mail.xxxxxxxxxxx.org
X-Postfix-Queue-ID: 0C4C1108F80
X-Postfix-Sender: rfc822; xxxxxxx@xxxxxxx.org
Arrival-Date: Fri, 19 Oct 2007 11:01:46 +0100 (BST)
Final-Recipient: rfc822; xxxxxx@ntlworld.com
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; host relay.plus.net[212.159.11.46] said:
550-Verification failed for <xxxxxx@xxxxxxx.org>
550-Unrouteable address 550 Sender verify failed (in reply to RCPT TO
command)
==================================================
-----Original Message-----
From: Mail Delivery System [mailto:Mailer-Daemon@ptb-relay03.plus.net]
Sent: 19 October 2007 10:48
To: xxxxxxx@xxxxxxx.org
Subject: Mail delivery failure: returning message to sender
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
xxxxxxx@tiscali.co.uk
SMTP error from remote mailer after MAIL
FROM:<xxxxxxx@xxxxxxx.org> SIZE=4236:
host mx6.uk.tiscali.com [212.74.100.152]: 553
<xxxxxxx@xxxxxxx.org> unable to verify address
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