Hello,
Our emails sent by our clients at midsouthtransport.com are getting delivery error "501 Connection rejected by policy [7.7]. I have checked and our server IP address 162.144.39.143 and it is not blacklisted. The client does use SpamExperts.com and I can see that one of their IP addresses lastmx.spamexperts.net IP 209.58.136.65 IS blacklisted by BACKSCATTERER but since that is a program designed to protect from spam in incoming emails and not outgoing emails I don't know why it would affect our server reputation or cause a problem getting emails to Messagelabs.net clients.
The bounce back messages look like this:
-----Original Message-----
From: Mail Delivery System [mailto:Mailer-Daemon@server.dennisvberwyn.com]
Sent: Friday, December 01, 2017 3:01 PM
To: sandyl@midsouthtransport.com
Subject: Mail delivery failed: 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:
Tita_Rivera-Lim@apllogistics.com
host cluster6.us.messagelabs.com [216.82.241.100]
SMTP error from remote mail server after initial connection:
501 Connection rejected by policy [7.7] 22011, please visit
www.messagelabs.com/support for more details about this error message.
Neil_Ma@apllogistics.com
host cluster6.us.messagelabs.com [216.82.241.100]
SMTP error from remote mail server after initial connection:
501 Connection rejected by policy [7.7] 22011, please visit
www.messagelabs.com/support for more details about this error message.
IFS_LCL_imports@apllogistics.com
host cluster6.us.messagelabs.com [216.82.241.100]
SMTP error from remote mail server after initial connection:
501 Connection rejected by policy [7.7] 22011, please visit
www.messagelabs.com/support for more details about this error message.
The clients sent a request to investigate the issue about a week ago and we haven't heard anything yet. I checked here on Symantec and our server is not blacklisted by Symantec. This is affecting their business.
Please advise?
Mia McPherson