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Delivery restriction check failed because the sender was not authenticated when sending to this group (in reply to RCPT TO command) - PC✗3
Delivery restriction check failed because the sender was not authenticated when sending to this group (in reply to RCPT TO command)

Delivery restriction check failed because the sender was not authenticated when sending to this group (in reply to RCPT TO command)

Email sent from one cpanel email account to another user is rejected with the error message:

550 5.7.133 RESOLVER.RST.SenderNotAuthenticatedForGroup;
authentication required; Delivery restriction check failed because the sender was not authenticated when sending to this group (in reply to RCPT TO command)

image 18 - Delivery restriction check failed because the sender was not authenticated when sending to this group (in reply to RCPT TO command)

This error message is self-explanatory and indicates that the recipient address is configured to only allow authenticated senders. Because your domain is not authenticated to the recipient’s domain, the email is blocked.

This is a usual occurrence with email lists (distribution groups), for example when you try to send an email to a list that you are not part of, your email will either be held in the queue for approval by the List admin or rejected.

whoami
Stefan Pejcic
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