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Getting 530 5.7.1 Relaying Not Allowed When Sending SMTP Traffic To An External Domain (Doc ID 2364478.1)

Last updated on NOVEMBER 03, 2023

Applies to:

Oracle Communications Messaging Server - Version 8.0.0 and later
Information in this document applies to any platform.


Our domain is We don't use authentication for any our Outlook and Thunderbird clients. For a particular user account, if I send mail internally to an address, there is no problem. I can also send mail from Thunderbird internally or externally with no problem.

When using the Outlook 2016 client and sending to an external domain, we get a "530 5.7.1 Relaying not allowed without prior authentication" error.  Here are examples:


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