On 24 Jan 2018, at 12:06, Randall Gellens wrote:
On 22 Jan 2018, at 7:01, Bill Cole wrote:
[...]
Apple's mail system has a history of authentication flakiness, with
periods where some nodes have required a bare username while others
only work with the full email address as username. Also, they have
been moving away from the mac.com domain for a while, and while I
think mail.mac.com should still work, it's fast-flux DNS via Akamai
is much faster (30s) than the {imap,smtp}.mail.me.com hostnames given
at https://support.apple.com/en-us/HT202304 and that can cause
glitches.
What are the optimal servers to use?
As it says on the linked page: imap.mail.me.com port 993 (imap+tls) to
retrieve mail and smtp.mail.me.com port 587 (SMTP-based message
submission with STARTTLS) to send.
I can't say with any certainty that the legacy mail.mac.com name won't
work essentially forever or that it resolves to a set of machines that
behave inherently or reliably differently from the me.com names. It's
just that Apple stopped documenting its existence a few years ago and
has its DNS set up to require clients to recheck the name every 30s,
where the 'new' names last for 5 minutes. That difference *shouldn't*
break anything, but short DNS TTLs have a history of exposing software
that makes shaky assumptions about name stability.
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