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550 "sender's policy" error when sending to one email domain 0 Recommended Answers 1 Reply 0 Upvotes
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Every time I try to send an email to a particular email domain (the tutoring agency I am working for), even if I'm replying to an email they sent me, the email gets bounced back with the following message:

The response from the remote server was:
550 Sender's policy prohibits this message: Quarantine

I get the same problem when trying to email either of my regional co-ordinators. The agency is perfectly reputable

Any idea as to why I'm getting the message and is there anything I can do to stop the problem?

Many thanks.
All Replies (1)
Often, messages from Gmail can be treated differently by the receiving domain for any of the following reasons:
  • User preference where the user/users have marked similar messages as spam. 
  • Domain policy where the receiving domain has a blacklist/policy definition marking specific/all emails from a domain (in this case Gmail/Google) as spam.
  • Events where the message is received by the domain but segregated/quarantined for some policy reason and not delivered to the intended inbox.
When the receiving domain doesn't maintain a secondary list, these problems may arise as well. The reputation of the sending IP's maintained by SORBS (or, Spam and Open Relay Blocking System) or any other such provider such as SpamAssassin or Barracuda is according to their own standards and Google can't interfere in that process asking those agencies providing the list to whitelist them. The agencies understand this as well and hence recommends that their list should not be used as a stand-alone.
 
You need to pass this message over to the recipient using some other medium of communication.
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