We have started receiving delivery failures to the admin account for the primary domain. A typical error is Invalid Final Delivery User ID this appears to only occur with some mail servers and mail to users on virtual domains appears unaffected. This has only started in the last 3-4 days, no updates have been done in this time. Mail delivery to admin is OK locally. Any other account set up to work with the primary domain is also affected.... Any suggestions as to what is going on?
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