PRB: Incoming email to a domain is blocked by firewall

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PRB: Incoming email to a domain is blocked by firewall

This article applies to:

  • Trustwave SEG/MailMarshal SMTP
  • Watchguard Firewall


  • New local domain added
  • Mail from external servers is not delivered
  • MailMarshal server logs show connection established but quit before email body was received
  • Possible error message '553 Requested action not taken: mailbox name not allowed or chunk too large'


  • Watchguard Firewall Proxied SMTP Server is blocking transmission.


Ensure that the Watchguard firewall settings for Proxied SMTP Services are configured to allow incoming email to the new domain.


  • For details of Watchguard configuration please refer to Watchguard documentation.
  • Other vendors' firewalls may cause similar issues.

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Article ID: 11286
Last Modified: 7/22/2008
Type: PRB
Article not rated yet.
Article has been viewed 5,312 times.