[MlMt] one account (of eight) constantly displaying mailboxes as "unavailable"

[Michael Dunston]

One of the eight accounts I have configured in MailMate is constantly 
displaying the mailbox sources as “unavailable” every 30 seconds or 
so.  This account is my main university account, which is 
(unfortunately) no longer hosted by the university but through a 
“partnership” with Google to offer email and collaboration services 
through the Google Apps for Education program.  Curiously though, 
another one of the eight account I have configured in MailMate is a 
personal Gmail account and it does not seem to have this problem.  More 
specifically it seems that this happens at least once or twice 
per-minute, where the account mailboxes become “unavailable” for 
about 10-12 seconds, come back for about 20 seconds, and then repeat 
this cycle continuously.

I see a thread in the MailMate list archives from 18-Feb-2015 which 
mentions this behavior may be a known issue with Gmail for some users on 
some networks, but so far it seems to happen on every network I’ve 
tried - including my university networks.  Unfortunately this was not 
one of the accounts I used when testing MailMate these last few weeks; 
has anyone else who has experienced this discovered any insight into the 
issue?   Would log files be of any help in diagnosing the problem, or is 
there anything else I could do to help troubleshoot this?  Thanks again!