[Evolution] Cannot retrieve mail from POP server

[Jonathan Ryshpan <jonrysh pacbell net>]

Frequently after not using Evolution for a while attempts to retrieve email from my POP server fail.  Presumably there are too many messages for the interface to deal with. There is a long delay while Evolution is concluding that it truly cannot reach the server, then the message:

Error while Fetching mail from “jonrysh pacbell net”.

Cannot get POP summary: Broken pipe

It is possible to retrieve the mail using an IMAP interface to the same server, after which it's possible to retrieve email using POP . What's going on?

System info:

4-processor Real Intel Hardware

Fedora-26

Evolution 3.24.5-1.fc26

POP Server: inbound.att.net

IMAP Server: imap.mail.yahoo.com