Error: 550 is _my_ address

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The 550 error is a SMTP (Simple Mail Transfer Protocol) error code that generally refers to a mailbox that isn't found or is unavailable for some reason. The is the loopback address, which typically refers to the same machine that the request is being sent from.

In order to fix this, in your SSH, as root, run:

Code: Select all

mcedit /etc/exim4/exim4.conf.template
Comment those 2 lines: ... #L103-L104

Restart exim:

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systemctl restart exim4

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