[Evolution] Mail port changed

[Van Snyder <van snyder sbcglobal net>]

I have Evolution 3.28.5 (3.28.5-8.el7)  on Scientific Linux 7.10 
(essentially the same as CentOS 7.10).

I set up accounts for imap on port 993. They kept getting "socket timed 
out." So I checked the settings. They've back to POP on port 143. I 
changed them back to 993 and then checked. They always go back to 143. 
Except for one account, which keeps on working. The "Mail Accounts" tab 
on the "Preferences" page shows "imapx" for all of them.

I tried re-installing evolution, but the same result ensues.