Since updating to Version 15.3.6109 we are having problems with email to all aol.com accounts and the occasional hotmail account.
Nothing has changed except for the update. I have looked at a couple of threads posted here but they do not lead to a solution. We are not blacklisted with AOL.
I have sent emails from outside our system to the same email address with no issues.
We are getting the following delivery failure errors.
Failed Recipient: email@example.com
Reason: Remote host said: 601 Failed to connect to the recipients mail server. No MX records were found for the 'aol.com' domain.
Status: 544 5.4.4 Host not found (not in DNS).Attempted to send the message to the following ip's:
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