I'm also a former Comcast customer for many years and elected to keep my comcast.net address after we moved to a "non-comcast" location. for the last month or so I'm getting intermittent email sending failures (receive is fine). I get 2-3 differnt messages but always involve the SMTP server. Then some time later it work fine. Interestingly, when the failure occurs, I can connect to my PC to my phone hotspot and it works fine. so, I thought it was an issue on my end with my current ISP -- their tech support could not find an issue. So, like you, I can't get help from Xfinity since I'm not a paying customer. I really don't want to go through email address changes but may be forced to do so.
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