I'm trying to send email to someone at University of Cagliari in Italy. His email is email@example.com. Comcast is refusing to send the message, returning the perminant error message below.
I know that the address is good. My friend (not using Comcast) has no problem sending email to this person. I believe that Comcast has some sort of blacklist/whitelist that I can access to permit my email to go through; what is it?
To eliminate the false premise that the problem had something to do with my email client, the message rejected below was sent using Xfinity webmail.
................. perminant error message from Comcast follows
Date: Wed, 06 May 2020 18:51:21 +0000
Subject: Permanent Error
Solved! Go to Solution.
The domain unica.it is refusing communication from comcast.net. Unfortunately, we wouldnt know what type of filtering they are using to block the email traffic and you will need to try to reach out to the IT contact/Network Administrator for unica.it for further resolution.