Article ID: 5972, created on Jan 21, 2009, last review on May 11, 2014

  • Applies to:
  • Plesk 10.x for Linux
  • Plesk 9.x for Linux/Unix


Emails cannot be sent through AtMail. When click Send Mail popup window is created with the following message:

Could not send message to SMTP server. Check that you have access to send messages via the server and that all To/CC/BCC addresses are valid\nError: SMTP Server rejected mail. Returned:553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)

What may cause the problem?


The error is caused by iptables rule to change the outgoing IP of port 25 . Add the IP address to whitelist to resolve the problem:

Home -> Mail Server Settings -> White list


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