|If you are trying to send email to local domains on your server, but exim returns this error:|
550 relay not permitted, authentication requiredit means that exim doesn't think the domain is local. This is controlled by the file:
/etc/virtual/domainsso your domain is likely just missing from that file. Add the domain to that file to make the domain local.
This is related to this feature:
Using an external Mailserver
where the User has the ability to un-check the "Local Mailserver" option, causing the domain to be removed from the domains file.
|Using an external Mailserver|
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