Some emails from certain senders are not getting to me.
I have had at least two service providers (travel agent and a pool service) that when they send me an email on my comcast.net address they disappear. They don't go to junk (I'm very careful about that and always check). They will try again to resend and still... nothing. The only work around I have found is to use my gmail.com address and for some reason that seems to work. Is there a Thunderbird setting that is blocking these emails? Is it a Comcast issue? Thanks for your help and at least thinking about the problem.
ప్రత్యుత్తరాలన్నీ (1)
There is nothing in Thunderbird that would selectively block messages like that. You can intentionally create filters that can delete messages according to criteria that you specify. This seems unlikely because you would know if you had created such filters, but have you checked the Deleted folder?
Otherwise, the first sanity check would be to watch your Comcast web mail page. If the missing messages are visible, then we'd have to figure out if/why they are not being downloaded by Thunderbird. If they never show up there, then Thunderbird would never know about them.
You don't say how long this has been going on, but I have seen it happen where some sender's mail has gotten stuck in their outgoing queue for whatever technical reason, but they eventually get released and arrive at their destination. Similarly, Comcast could be having a technical issue and some emails may be stuck in their system for a while before being released.
If a sender's email can't be delivered after a period of time (could be hours or days,) they usually get a server-generated non-delivery message. Have your senders received anything like that?
I think it's a Comcast issue.
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