Yes. I noticed the exact same issue at the exact same time as you did. Comcast definately changed something. I have noticed in the past that Comcast would "eat" email that didn't pass SPF. SPF is all set up, so that isn't the issue here. It sure would be nice if Comcast would bounce the email if they had a problem with it rather than just accepting it, but not delivering it.
I have program that monitors my generator on a Raspberry Pi. That also sends email to Comcast on port 587, but for some reason that is still working. It's just my sendmail that is broken as of today.
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