For what it's worth - I have been having the same issue with Mail.app on iOS. Not sure about macOS since I use Thunderbird.

I suspect it's an issue with the client itself - Mail.app. Not seeing anything in logs that would indicate an IMAP server issue.

If it's been awhile since I opened the client (ie, overnight), the status bar does show "Downloading {num_messages} Messages" but UI never updates with the latest messages. In order to fix it, I have to close and re-open the Mail.app.

Thunderbird on macOS works fine. Maybe issue is with my large mail box (40,000+ e-mails) and Mail.app is just poorly optimized? Or maybe new features -- "Categories" and "Apple Intelligence" -- broke the client?

Devices:

• iPhone 15 Pro Max -- iOS 18.3.1

Darren

On 2/23/25 05:46, Simon Hoffmann via dovecot wrote:

Hey list,

I am experiencing a strange problem where I don't even know where to begin to debug.

I am running my own email server in my office. The server itself works fine.

In my office firewall, I have set up DNAT/port forwarding to be able to access the server from outside.

With my Android phone and my iPad I have no problems accessing the mails from anywhere, including my home WiFi.

However with my iPhone, I have problems accessing my inbox when I am on my home WiFi. The problems only started a few weeks ago, it worked fine for years before. I have not changed any network related settings.

Now, when I am on my home WiFi, I cannot use the "pull down to refresh" gesture. It just is not fetching any emails. The automatic sync/fetching is also not fetching the newest emails. Eventually, some emails will come through, but they are from ~6-7 hours ago. Same WiFi as my other devices that work fine. As soon as I disable WiFi on my iPhone and switch to mobile data and do the "pull down to refresh" gesture, all mails from the last 6-7 hours immediately come in.

Has anyone ever experienced something like this and can help me analyse the problem?

root@mx01:~# uname -a Linux mx01 5.10.0-33-amd64 #1 SMP Debian 5.10.226-1 (2024-10-03) x86_64 GNU/Linux root@mx01:~# cat /etc/os-release PRETTY_NAME="Debian GNU/Linux 11 (bullseye)" NAME="Debian GNU/Linux" VERSION_ID="11" VERSION="11 (bullseye)" VERSION_CODENAME=bullseye ID=debian HOME_URL="https://www.debian.org/" SUPPORT_URL="https://www.debian.org/support" BUG_REPORT_URL="https://bugs.debian.org/" root@mx01:~# dpkg -l dovecot* ||/ Name Version Architektur Beschreibung +++-======================-========================-============-=============================================== un dovecot-abi-2.3.abiv13 <keine> <keine> (keine Beschreibung vorhanden) un dovecot-common <keine> <keine> (keine Beschreibung vorhanden) ii dovecot-core 1:2.3.13+dfsg1-2+deb11u2 amd64 secure POP3/IMAP server - core files un dovecot-gssapi <keine> <keine> (keine Beschreibung vorhanden) ii dovecot-imapd 1:2.3.13+dfsg1-2+deb11u2 amd64 secure POP3/IMAP server - IMAP daemon un dovecot-ldap <keine> <keine> (keine Beschreibung vorhanden) ii dovecot-lmtpd 1:2.3.13+dfsg1-2+deb11u2 amd64 secure POP3/IMAP server - LMTP server un dovecot-lucene <keine> <keine> (keine Beschreibung vorhanden) ii dovecot-managesieved 1:2.3.13+dfsg1-2+deb11u2 amd64 secure POP3/IMAP server - ManageSieve server un dovecot-mysql <keine> <keine> (keine Beschreibung vorhanden) un dovecot-pgsql <keine> <keine> (keine Beschreibung vorhanden) un dovecot-pop3d <keine> <keine> (keine Beschreibung vorhanden) ii dovecot-sieve 1:2.3.13+dfsg1-2+deb11u2 amd64 secure POP3/IMAP server - Sieve filters support un dovecot-solr <keine> <keine> (keine Beschreibung vorhanden) un dovecot-sqlite <keine> <keine> (keine Beschreibung vorhanden) un dovecot-submissiond <keine> <keine> (keine Beschreibung vorhanden)

Thanks!

Cheers, Simon

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