Re: variable expansion allowed in 'listen' config not working

Can you try

listen = $ENV:LAN_IPv4 , 127.0.0.1

note the space before comma

Aki

 On 20/09/2025 15:46 EEST publists--- via dovecot
 <[1]dovecot@dovecot.org> wrote:


 Hi,

 In a new dovecot 2.4 config I'm setting up a inet_listener for a
 service.
 I want to use an env var in `listen` expansion, like

 service imap-login {
 inet_listener imaps {
 listen = %{env:LAN_IPv4}, 127.0.0.1
 }
 }


 This

 [2]https://doc.dovecot.org/2.4.1/core/settings/variables.html

 says

 "You can use special variables in several places:
 All settings, except of type String without variables."

 Reading

 [3]https://doc.dovecot.org/2.4.1/core/summaries/settings.html#listen

 `listen` directive allows

 listen
 Default *, ::
 Value IP addresses

 Unlike, for example

 deliver_log_format
 Default msgid=%{msgid}: %{message}
 Value String without variables

 which would be disallowed for "String without variables"

 I CAN use env vars across almost all of my config.

 But launch

 systemctl start dovecot

 fails with

 dovecot[17358]: Fatal: service(imap-login) Can't resolve address
 %{env:LAN_IPv4}: Name or service not known

 OTOH replacing

 - listen = %{env:LAN_IPv4}, 127.0.0.1
 + listen = 10.1.1.1, 127.0.0.1

 solves the launch issue.

 Like I said it works in other stanzas.
 Am I configuring this right for `listen`?

 Thanks,

 Dave
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