Hello,
Michael Slusarz via dovecot wrote on 12.02.25 at 19:56:
Timo confirmed this type of message (see below) breaks iOS mail clients
regardless of the IMAP server used. So it is almost certainly a client issue.
We are in contact with the Apple Mail developers and have provided this debug
information to them.
IIRC, there was also an article from Heise back last year, with several
mail providers affected, and the problems started straight away with iOS 18.
Based on Aki's feedback, I tried to do a rawlog of one of the problems
(initial connection taking very long, first I see "Connecting.." and
then "E-mail download.."), but even with the pre-login log, I could not
get any data.
I didn't get to try the test mail from Timo yet.
My gut feeling is that this problem is possibly related to SSL/TLS. I
remember Apple changed something with self-signed certificates, so maybe
there are some artefacts also with valid (in my case Let's Encrypt)
certificates. I played a bit with my SSL settings, to not avail.
Independent of the login issue, I also have the issue that some mails
are just not loading, in particular HTML messages, sometimes also
certain attachments do not download.
For both problems, I cannot always reproduce them, and I do have the
feeling they temporarily get better when I kill the Mail.app.
They are independent from the connection, provider, router etc. Also a
direct mobile connection, or IPv4 only, do not fix the issue.
Glad to see work on this is ongoing - thanks so much, I can only guess
how tiring it is to fix broken client implementations...
Florian
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