Problems of a user sending emails to external domains

Question

There are problems with sending mail to external mail from my domain.

The Outlook message states:

Error: 550 5.7.1 Command rejected
Message rejected by: relay-us-east-2.prod.hydra.sophos.com

Only that user has the problem, the other users are working no

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josepalad · Answer

Sistemas AL Thank you for posting into the Community forum. Command rejected may mean that there is no Mailbox present for that email address within Sophos Email. Here is a link to possible causes of this error: community.sophos.com/.../sophos-email-550-5-7-1-command-rejected-error-on-outbound-emails-gateway-mode 
 Another reason could be that Sophos Central has detected that the email address may be sending spam emails out. In this case, I would recommend getting a support case created so it can properly be investigated. Thanks! Regards, Jose

Problems of a user sending emails to external domains

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