Intermediate SMTP failure
Posted on 2006-05-23
I am working for a client who has a Domino server and in its log file is receiving error messages of not being able to connect to a MX server, but a few seconds later they are able to send to another MX server from the same domain.
Error transferring to mailin-03.mx.AOL.COM; SMTP Protocol Returned a Permanent Error 550 REQUESTED ACTION NOT TAKEN: DNS FAILURE
Transferred to mailin-02.mx.AOL.COM
Later on in the day a message was successfully transferred to mailin-03.mx.aol.com. If this company has reverse dns setup, a static ip address, and not blacklisted what could be the reasoning for this kind of message?