> On 19 Aug 2022, at 17:34, Simon Harrison <i...@simonh.uk> wrote:
> On Fri, 19 Aug 2022 13:00:27 +0200
> Kamil Andrusz <w...@mniam.net> wrote:
>> Hello All,
>> I’ve an old existing setup where I have existing system users. I
>> would like to add new domains and use virtual users (no need for them
>> to have system accounts). The system has only one IP available.
>> I implemented the expected solution on Dovecot side simply by using
>> multiple passdb/userdb entries.
>> However I can’t figure out how (or if it’s at all possible with a
>> single IP) to get SMTP AUTH working for both system and virtual users
>> with OpenSMTPD.
>> Is that possible and if it is, any hints how to do it?
>> Thank you in advance!
>> With best regards,
>> Kamil Andrusz
> According to the man page it is supported:
> https://man.openbsd.org/smtpd.conf
> listen on interface [family] [options]
>   Listen on the interface for incoming connections, using the same
> syntax as ifconfig(8). The interface parameter may also be an interface
> group, an IP address, or a domain name. Listening can optionally be
> restricted to a specific address family, which can be either inet4 or
> inet6.
>   The options are as follows:
>   auth [<authtable>]
>       Support SMTPAUTH: clients may only start SMTP transactions
>   after successful authentication. Users are authenticated against
>   either their own normal login credentials or a credentials table
>   authtable, the format of which is described in table(5).
> From one of my conf's (using a credentials table):
> table secrets file:/etc/mail/secrets
> listen on eth0 port 465 smtps pki mydomain.com auth <secrets>
> match from auth for any action "relay"
> Good luck!
The problem is that both domains are assigned to the same IP.
In my lab setup I have the following entries in /etc/mail/smtpd.conf:
listen on openbsd.test port submission tls-require pki „openbsd.test" hostname 
„openbsd.test" auth
listen on example.com port submission tls-require pki „mail.example.com" 
hostname "mail.example.com" auth <credentials>

The end result is (/var/log/maillog):
Aug 19 19:10:50 openbsd smtpd[30326]: info: OpenSMTPD 7.0.0 starting
Aug 19 19:10:51 openbsd smtpd[10313]: dispatcher: smtpd: bind: Address already 
in use
Aug 19 19:10:51 openbsd smtpd[17852]: smtpd: process dispatcher socket closed

So using domain name does not work.

With best regards,
Kamil Andrusz
It’s just a matter of opinion.

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