Emails are still being blocked by messagelabs from our email server @ 198.49.0.3 to a bunch of our customers using Symantec.
Checking the ip at http://ipremoval.sms.symantec.com/lookup/ says “198.49.0.3 does not have a negative reputation and therefore cannot be submitted for investigation”
We called Symantec support, and they refused to talk to us (I guess we might be spammers) and told us to get our customers that are Symantec customers to call instead.
We had two companies enquire now and create tickets. One was simply told “that IP is not being blocked”.
Another stated we were sending wrongly to cluster6a.us.messagelabs.com instead of cluster6.messagelabs.com, apparently the “a” servers are spam traps, and suggested we should flush our DNS.
For the customer in question, our DNS correctly returns cluster6 and cluster6a, with 6 being the lower number. Our email server tries 6 first and fails, and only then fails over to the cluster6a server, which times out.
Testing using telnet to port 25 to cluster6 returns 550 Requested action aborted [4] 4410, please visit www.messagelabs.com/support for more details about this error message.
This just started last week. I checked mxtoolbox and there are no blacklists, errors etc.
This is causing a major headache for us, and is really poor support by Symantec.