> On Feb 1, 2018, at 11:31 PM, Olivier <olivier.nic...@cs.ait.ac.th> wrote:
>
> I apologize if tht has already been posted, but I could not find any
> reference.
>
> I recently upgraded my postfix server from 2.11.6 to 3.2.3_1.
>
> Postfix server runs on a FreeBSD OS. The upgrade was seamless for all
> the users except the users connecting from a Mac:
>
> - a Mac that never used the Mail app could connect immediately to
> posftix SMTP, using any mail account
>
> - a Mac that previouslu sued Mail app could connect to account that we
> never used before, but could not connect to pre-existing accounts
>
> - furthermore, if you create a new Mac user, he can use any email
> account.
>
> In the second case above, if I remove the previous email account on the
> Mac and recreate it, then it works.
>
> Is that a know problem? Is there a fix?
Users read their mail via IMAP, and Postfix is not an IMAP server.
Perhaps your certificate changed and was pinned to the IMAP account
on the client. Or some SASL issue, or other IMAP settings. Look
in the IMAP logs.
--
Viktor.
