One of my design clients has an issue with sending email out to customers who use a comcast email address. He currently has Outlook configured to send out email from his site in HTML format. However, lately, when sending an email to a comcast-based customer, he receives an error message saying that comcast does not accept HTML based emails (it's also a problem with yahoo based email accounts).

So I walked him through changing his outgoing mail in Outlook to Plain Text. However, now, when sending an email out in Plain Text, he still receives a bounce message from comcast saying:
This Message was undeliverable due to the following reason:

Each of the following recipients was rejected by a remote mail server.
The reasons given by the server are included to help you determine why each recipient was rejected.

Host comcast.net doesn't support SMTP mail delivery.

Huh???? They don't accept SMTP mail delivery??? What the heck is that about?

Your help would be appreciated in solving this matter.

Vito

If he has his own domain and hosting elsewhere, he can try changing smtp port to 587 and bypass the comcast mail servers. Make sure he is using the hosts mail server to send mail, not the comcast servers.

Actually, I already have my client set up on Port 587 sending email from MY server. The comcast issue is not sending out FROM comcast, it is an issue of sending TO a comcast address.

Vito

Had a client with the same issue. The client is using bellnet as an internet provider. I was able to replicate the problem by using smtp10.on.aibn.com as an outbound. Changing to smtp1.sympatico.ca resolved the problem.