Trouble delivering emails to Messagelabs (Symantec) servers.

Hi,

It was reported that emails sent to some clients weren't delivered on time, sometimes with a delay of a day after it was sent.

​I asked to support team of our mail server to check what could be happening and and was told that emails delivered to domains on messagelabs servers probably are being rejected.

​When trying to telnet port 25 to cluster6.eu.messagelabs.com ​for exemple, sometimes there's no response, same as other servers from messagelabs.com.

There's no problem with IP using http://ipremoval.sms.symantec.com/​.

Can you check with your servers if there's issues with our IP??

Thanks