POP failure to receive. Server does not support encryption type

After working OK for 3 weeks or so, the POP and IMAP connections started failing. In a running client, it adds the error code 0x800CCC1A. When the server was first installed, it started doing that and it was resolved when I installed a valid CA certificate.
Outlook Anywhere and OWA continue to work, both inside and outside, and we never get any certificate mismatch errors. Oddly enough, I can send email with a POP (or IMAP) account but not receive. Since this seemed to point to the certificate, I have double
checked it. There are 4 certs, 3 are self signed: the Exchange Server Auth, Exchange Delegation and WMSVC. The 4th is the SAN cert, from a CA. I removed all services from the 3 self signed certs and the CA cert has all 4 services. The Auth Cert keeps giving
itself back the SMTP but the failure occurs even if I remove that cert.  I have not found any errors in the event log that match the time of testing. 
We are running Exchange 2013, CU7, on  a 2012 R2 Std Server. The DC is a 2012 R2 Essentials server. 
Any suggestions appreciated.
Lou
Louyo

Hi Lou,
According to your description, I understand that POP account can’t receive message with error “0x800CCC1A”, however it can send message without error.
If I misunderstand you concern, please do not hesitate to let me know.
I want to double confirm whether all POP3 account or some special account experience this issue?
Error “0x800CCC1A” means that the Secure Sockets Layer (SSL) encryption is turned on for your e-mail account or firewall prevent.
Please try to disable SSL to test: File---> Account Setting---> Change, switch to POP3 and IMAP setting then disable SSL.
If the issue persists, please try to run below command to ensure whether SSL or TLS is used for POP3:
Get-PopSettings –Server server1 | FL Identity, X509CertificateName
Best Regards,
Allen Wang

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