SMTP Communication Problems

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

My message isn't reaching its intended recipient.

The message I get is:

There was a SMTP communication problem with the recipient's email server.
Please contact your system administrator.
<doman #5.5.0 smtp;553-mail rejected because your IP is in DUL. See>
 
dtmr said:
My message isn't reaching its intended recipient.

The message I get is:

There was a SMTP communication problem with the recipient's email
server. Please contact your system administrator.
<doman #5.5.0 smtp;553-mail rejected because your IP is in DUL. See>
Click to expand...

"DUL" (dial-up list) is a dial-up black list. ISPs have their address
spaces segmented into various parts, including a group (or groups) of
addresses strictly used for dial-up. These addresses should never be
sending mail directly to servers other than their own ISP's mail servers,
which will forward the messages. Other mail servers reject mail sent from
any dial-up addresses because more likely than not, it's a SPAM attempt.
 
Thank you Brian, at least I understand what is going on, but not how to sort
the problem out. Any suggestions?
 
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