Email Security.cloud

Hello,

I am writting as Linakis Digital company's System Administrator.

We have a mail server which cannot send mails to some domains (vodafone.com / minerva.com.gr) which use as SMTP cluster5.eu.messagelabs.com & cluster3.eu.messagelabs.com.

Below is telnet outcome from this server.

C:\>telnet cluster5.eu.messagelabs.com 25
Connecting To cluster5.eu.messagelabs.com...Could not open connection to the host, on port 25: Connect failed

C:\>telnet cluster3.eu.messagelabs.com 25
Connecting To cluster3.eu.messagelabs.com...Could not open connection to the host, on port 25: Connect failed

Note that from our other Mail server we can send emails and we can telnet on port 25.

We also tried blacklist tool http://ipremoval.sms.symantec.com/lookup/  and we got response " The IP address you submitted, X.X.X.X, does not have a negative reputation and therefore cannot be submitted for investigation."

Please advice and also inform us if there is a way to send you the Mail Server IP on some private message to further investigate.

Regards,

Kyriakos Tzanoulinos

Hello,

Please provide some update as we have major issue. Our clients cannot send emails to domains which use your SMTP servers.

Regards,

Kyriakos Tzanoulinos

Submit a sample of the email that's blocked to:

investigation@review.symantec.com 

reference link: http://www.symantec.com/docs/TECH82881

Hi

Can you confirm the IP that you are connecting from? It may be the subject of throttling. If so once you provide your IP I can check and remove as necessary,

Regards

Ian Tiller

Tier 2 Senior Technical Support Engineer

Hello,

Is it possible to send you the IP on a private message? I would not want to post my Mail Server's IP on public.

Regards,

Kyriakos Tzanoulinos

Hi

I recieved your PM and can confirm your IP was being throttled to the point where we would reject connections.

I've now removed that throttling so you should not see any further issues with this moving forwards.

Regards

Ian Tiller

Tier 2 Senior Technical Support Engineer

Hello,

First of all thank you for your prompt answer and actions. Secondly, can you confirm that my mail server's IP throttling has been totally removed?

Though I can now telnet port 25 on most of your smtps, I still cannot to cluster3.eu.messagelabs.com for example. There may be more, just need to make sure.

Thank you,

Kyriakos Tzanoulinos

Hello again,

After testing again, today i can also telnet to cluster3.eu.messagelabs.com smtp. So I assume that my server is on no throttling list.

Thank you again for your support,

Kyriakos Tzanoulinos