Re: Android 11: App polling interval is not 15 minutes minimum?

VanguardLH <V@nguard.lh> wrote:

I've been reading some web forums on e-mail clients, like for K9 on
Android where users complain they were forced to 15-minute minimum mail
poll intervals.  Some users don't have IMAP servers that support PUSH,
so they rely on very short poll intervals to react on e-mails within a
very short time they remain viable (e.g., 2FA codes that expire, job
contracts sent to a list of freelancers where the first to respond gets
the job).  The users thought a new version of K9 had implemented a
change to 15 minutes between mail polls from the prior version that
allowed down to 1-minute polls.  The conclusion was that Android 11 had
a restriction that apps were not allowed to poll servers at less than 15
minute intervals.
 
When I check IMAP PUSH, it only works in clients on the Inbox folder.
If the server moved a new message into the Junk folder, PUSH isn't used
on that folder for the client to see a new message show up there.  I can
get 2FA codes via e-mail that end up in the Junk folder, and those codes
expire, and often far shorter than 15 minutes.  I cannot whitelist the
2FA codes, because the sender is unknown to let me add them to a
server-side rule trying to keep them out of the Junk folder.  Just
because I'm trying to log into a site that issues a 2FA code doesn't
mean that is the host name that sends the code.  Besides, user-defined
rules are exercised AFTER the server has already applied its spam
filtering, so user-defined rules are ran too late.  The false positive
has already been moved into Junk, so it isn't in the Inbox folder when
the rules get ran.  One of my e-mail accounts has a Safe Senders
whitelist which overrides the server's spam filtering, but other
accounts have no such whitelist that is effected before the server's
spam filtering.
 
Does Android 11 have a limit (which seems unpublished) that IMAP apps
cannot poll at shorter than 15-minute intervals?  That would suck.

  From this (your OP) and following posts, it seems your main concern is
your e-mails with '2FA' (read: 2SV) codes ending up in your (IMAP) Spam
folder without you being notified.

  Can't you just manually 'poll' your Spam folder after you've entered
your login credentials at the website? Or doesn't the Android mail
client you're using have such a manual-poll facility?

  FWIW, I hardly use e-mail on my phone, but I have the BlueMail and
K-9 Mail apps and both can manually poll my Spam folder.