Thunderbird connection error

[quiwy]

What type of hardware are you using

Other ARM board

What YunoHost version are you running

11.2.31

How are you able to access your server

The webadmin
SSH
Direct access via physical keyboard/screen

Are you in a special context or did you perform specific tweaking on your YunoHost instance ?

yes

Describe your issue

Hi,

I’ve configured a catchall on my server to receive all emails sent to my domain in a single user’s inbox, and it’s working well. After three years of procrastination, I’ve finally set up a Sieve filter to create a folder for each “to” address.

/* Create folder for all other emails */

if address :localpart :matches ["to"] "*" {
    # Store the local part of the "To" address in a variable
    set :lower :upperfirst "localpart" "${1}";

    # Use the local part to create the folder name
    fileinto :create "INBOX.${localpart}";
    stop;
}

The filter works well, but in Thunderbird, I regularly see the following error:

Le serveur *** s'est déconnecté. Il s'est peut être arrêté, ou il y a un problème sur le réseau.

On the server side, I see these logs:

Oct 28 12:07:24 *** dovecot[2758744]: imap-login: Maximum number of connections from user+IP exceeded (mail_max_userip_connections=10): user=<***>, method=PLAIN, rip=***6, lip=***, TLS, session=<***>
Oct 28 12:07:25 *** dovecot[2758744]: imap-login: Maximum number of connections from user+IP exceeded (mail_max_userip_connections=10): user=<***>, method=PLAIN, rip=***, lip=***, TLS, session=<***>

I don’t experience this issue on K-9 Mail.

In Thunderbird, I tried adjusting the setting Nombre maximum de connexion à garder en cache to 1 (though I’m unsure of its effect).

Is there a way to increase mail_max_userip_connections? I’m not certain where to change this setting.
Or is there anything else I can change to avoid thunderbird errors?

Thank you for your help!

[quiwy]

Updated my thunderbird to thunderbird daily and no problem anymore. So I guess it will be fixed in next stable thunderbird.

[quiwy]

Hi,

I had some hope that my setup was finally working, but unfortunately, I’m still experiencing the same issue on a daily version.

If you have any idea feel free to point me in the right direction

[quiwy]

After upgrading to Yunohost 12, I revisited this issue and tried something I thought I’d already done, but it seems I hadn’t.

Here is the fix I used:

In /etc/dovecot/dovecot.conf, I added mail_max_userip_connections = 20 to the protocol imap block.

So now it looks like this:

protocol imap {
  imap_client_workarounds =
  mail_plugins = $mail_plugins imap_quota antispam
  mail_max_userip_connections = 20
}

This seems to be working for now.

If there’s a better solution, feel free to comment!