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Before posting my inquiry here I spent about an hour on the phone with Comcast tech support. After being transferred 6 or 7 times I spoke with an agent on the Security Assurance team. They were unfortunately as ignorant about what an SMTP server was as the first tech I spoke with. After trying to explain the issue they asked for a screen shot of the error message I was receiving. After sending this to them they came back on the line and told me there was nothing they could do because I was using a third party application and that if I wanted support I would need to have a business account. There was no convincing them that the issue was not related in any way to my client software. Needless to say this was a very frustrating experience with Comcast tech support.
The issue as far as I can tell is that when I changed my password and failed to update it in my application, Comcast has a mechanism which blocks IP addresses from authenticating after so many failed auth attempts which sounds like a reasonable response to me. Either someone removed my IP from this list or some timeout was reached with 0 failed auth attempts and my IP was removed from the list automatically.
The good news is that about 20-30 minutes after posting my original message the authentication issue was fixed and my emails started sending successfully.
You didn't say what email client you are using, but I would try deleting the account from it and re-creating it from scratch. Then see if that gets you sorted out. If not, then call Comcast security and see if they can spot anything wrong in your account-----------------------
Comcast Customer Security Assurance-------------------
Normal business hours (6:00 am to 2:00 am EST, 7 days a week)
1 - 888-565-4329
I recently changed my password and had a program trying to authenticate to the smtp.comcast.net relay servers using my old password. I've fixed that issue but am now getting this from the comcast smtp relay servers: "Excessive failed authentication, ESMTP server temporarily not available, please contact support"
I've searched the forums and think I have found the issue with a fix from this post: http://forums.xfinity.com/t5/Email-Web-Browsing/Re-I-ve-been-having-repeated-problems-with-ESMTP-ser...
How do I get my IP address cleared so that I can send email again?
Solved! Go to Solution.