This happened on the MailMate BETA, but I don't know if it's limited to
it or can happen in the stable version.
I use FastMail and they recently made some security upgrades[1], which
include two factor authentication (2FA), app-specific passwords, and new
imap and smtp server names.
[1]:
https://blog.fastmail.com/2016/07/25/two-step-verification-and-other-new-security-features/
Once you enable 2FA on FastMail, you *have* to generate app-specific
passwords. I generated a new password for MailMate to use, and went to
update the account information by right clicking on it in the list of
sources.
I put in the new password and changed the server names from the old
`mail.messagingengine.com` to `<protocol>.fastmail.com`.
What happened afterwards is that MailMate re-downloaded my entire email
content from FastMail. I know because I use Little Snitch and I could
see that MailMate used the same amount of bandwidth down as my used
space on FastMail.
It also reset some of the mailboxes that have "types". For example, I
had to re-tell MailMate which folder to use for Sent Messages, and which
one to use for Junk, and Trash.
I don't know if that's expected behaviour or not. It could be a really
expensive download for some people (I have the speed and bandwidth to
spare, so I'm good).
If it is unexpected but intended, is there a way to make it not happen?
If it is unavoidable for whatever reason, then this is a PSA to people
that this could happen, so if you plan on making changes to server names
and can wait for a time when you don't need your network or have free
bandwidth, you should do that.
Sherif
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