Question about %z variable in mail_domain and conflict with imap_host (

[reseko]

Hi everyone,

I have a technical question regarding how replacement variables work in Roundcube's configuration.

I am trying to ensure that new users automatically get the correct domain in their identity. My IMAP server (Dovecot) correctly returns mail.example.com when running dovecot --hostdomain, so I expected that setting:

$config['mail_domain'] = '%z';

would allow Roundcube to extract "example.com". However, the result is an empty string (users see their email as user@ without a domain). I have verified that if I change the variable to %t, it works perfectly, but I would like to understand why %z is failing.

I suspect the issue lies in how my IMAP host is defined, as I include both the protocol and the port:

Code Select Expand

$config['imap_host'] = 'tls://mail.example.com:143';
My questions are:

• What exactly does %z check? Does it extract information directly from the imap_host string, or does it query the system/server?
• Does the tls:// prefix or the :143 port break the parsing logic for the %z variable?
• Is %t the recommended workaround in these cases, or is there a way to make %z ignore the protocol and port?

Thanks in advance for your help!