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On Tue, 2024-02-06 at 22:31 +0530, Akshay Pushparaj via Postfix-users
wrote:
> I would like to know if i can configure postfix to forward mails if
> user not found in local recipient table.
>
> Usecase:
>
> Users are split between LDAP in my server and a remote server for
> example.com. So if u...@example.com is not present in LDAP it must
> forward to remote server.
My questions would be:
1. How much control do you have over the remote server?
2. Is the remote server using LDAP to identify users too?
3. If you have little to no control and LDAP is not being used, then
how co-operative are the administrators of the remote server?
In that case that 1 and 2 are true then slave the remote LDAP into a
separate directory on your local server and adjust the postfix
configuration to take it into account accordingly.
Other than that if you can get a valid list of delivery addresses from
the remote server scripting a solution to turn it into a valid map for
forwarding is relatively easy. If the administrators of the remote host
are not being helpful, and wanting you to split the hosting of addresses
for a domain you can either convince them to become helpful, or hand the
the entire domain to them. I will admit that at a previous employer I
had problems getting some of the other sysadmins to accept that with the
postfix/dovecot/ldap setup we had we could have mail delivered to
specific office servers (we had one mail server in the head office that
everyone, including offices in foreign locations, accessed via IMAP - we
frequently got complaints from overseas that email access was "slow". My
argument was that local delivery of their email would fix this and could
be done via existing VPN tunnels we had - some people mistook that as
local storage with remote dovecot using NFS to access mail stores).
- --
Nikolai Lusan Email: niko...@lusan.id.au
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