Fetching mail from external accounts via secure POP3 broken since Dec 101 Recommended Answer
Error fetching mail. Mail from this account has not been retrieved since Dec 10
with the following error message undert "View details"
SSL Security Error. [ Help ]
Server returned error "SSL error: self signed certificate"
The other Gmail account fetches mail ok. Again, both accounts fetch from the same external server!
From the point of view of the external server, the POP3 client who fails to fetch mails is at 220.127.116.11 whereas the POP3 client that fetches successfully is at 18.104.22.168. I am attaching a Wireshark packet dump which shows that the POP3 server rejects the connection setup with a TLS Encrypted Alert message.
Could this have to do with , e.g. the Google load balancers terminating SSL with a temporary self-signed client certificate? I think  and  might be related.
The problem has to be connected to the account itself, as I am able to setup a new account with the same settings and pop the mail without issue. App River tech support was able to run through the same setup using 3 other test accounts, which leads me to believe that there was some sort of data migration or service interruption that corrupted these specific accounts.
I am seriously considering setting up a brand new account a importing the email from the broken account into the working account, but that will take considerable time and effort (neither of which I am able to expend right now) - I am hoping a tech will see these posts and be able to discern the problem or at the very least acknowledge that they know there is a problem.
My issues began on Dec 10th - the same as you documented above.
that explicitly says "We do not accept self-signed certificates". what is your external pop3 server?
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