Email Security.cloud

I can't connect to any of the IP addresses of cluster8.eu.messagelabs.com (e.g. 216.82.251.39) for mail delivery via port 25 for many days.

Postfix receives a timeout and any TCP connection times out.

The source IP of our mail server is 78.47.9.251 (mail.itbt.it)  and it is not listed on any blacklist nor has any bad reputation marks on http://ipremoval.sms.symantec.com/lookup/

TCP connections from IP addresses within the same subnet (e.g. 78.47.9.252) are possible for connecting port 25/tcp and ICMP ping response packets are replied with an ICMP reply.

Though it seems all IP addresses of cluster8.eu.messagelabs.com are blocking incoming connection to port 25 from 78.47.9.251.

Could you please help me, with this problem? Pretty please.

Kind regards,

Loris

Hi Loris

Apologies for the delay in responding to you.

Can you confirm if this is still an issue for you? I've checked the usual things that could cause this and dont see an issue.

If it is an issue could you give me some examples of failed connections?

Thank you

Ian Tiller

Tier 2 Senior Technical Support Engineer

Ciao Ian,

i've found the issue and solved:

few monts ago due a misconfiguration by our customer we have receveid 2000 email in a hour (on a friday evening).... we have blocked the messagelabs network until waiting to talk to our customer.

.... we have forgot to remove the firewall rule.....

we have removed the rule and all woks fine.

Best Regards