Dear,
Our company offers web hosting services and email.
We checked our IP in several lists of "blacklist" and are not listed with a bad reputation.
We checked including the Symantec Web site at http://ipremoval.sms.symantec.com/lookup/
But even so, we still receive an email return as follows:
SMTP error from remote mail server after the initial connection:
host cluster4.eu.messagelabs.com [85.158.137.68]:
SMTP error from remote mail server after initial connection:
501 Connection rejected by policy [7.7] 3106, please for more details about this error message.
I believe the recipient's domain is a Symantec customer. And it seems that disreputable-list is not updated or applied on the client system.
This is very inconvenient for us, you will need to contact all these areas to raise the destination IP manually. There is a practical practice at all.
I would appreciate if someone could shed some light on this subject.
Thank