On Dec 18, 2024, at 3:25 AM, via dovecot <dovecot@dovecot.org> wrote:
I have a fairly new installation of the Dovecot server version 2.3.19.1 on Debian 12.8. [...] On version 18.2, the issue appears as follows: When you open the app, you can read several messages. They load correctly, but, for instance, attachments do not. If I wait for some time, the attachment eventually loads. During this time, I observe the server logs, and it shows that a certain session on the Dovecot server has ended.
As a point of comparison: We're using Debian 12.8 with Dovecot 2.3.21.1 from <https://packages.debian.org/bookworm-backports/dovecot-core>, and we have not had any reports of this. I know plenty of our customers use iOS 18 (as do I).
We did have a report of one customer who could not view _any_ messages on their iPhone after upgrading (their description was that the list view worked properly, including the short previews, but when trying to view individual messages, "it just shows a blank grey background"). But that customer had more than 72,000 messages in their Inbox folder, and archiving the older messages into different folders apparently solved it; I'm not sure if the problem was even related to iOS 18.
Btu anecdotally, you might want to try upgrading to Dovecot 2.3.21.1, and/or making sure that affected customers have a reasonable number of messages in all their folders.
-- Robert L Mathews