Mailman29 via Postfix-users:
> myhostname is set to "mail2" in main.cf, but the mx record points
> to mail.somedomain.com, (they share the same IP though) would it
> be doing an ip lookup first? I guess I need to "trick" it into
> thinking it's not the same if it's IP based.
Postfix requires transport_maps to forward mail from a front-end
MTA to a backend MTA. Other approaches are not supported.
Based on your earlier description I expect something like:
public IP address, port 25: haproxy ->
hidden port or address: frontend MTA with transport_maps ->
hidden port or address: backend MTA
If all this runs on a single host, and you use loopback (127.0.0.1)
for internal communication, then Postfix won't care whether servers
use the same MTA name.
If you use a non-routable network such as 10.* or 192.168.* for
internal communication, then you will need distinct MTA names.
However, for sanity sake, I'd always recommend that different MTA
instances identify themselves with different names. Otherwise youir
logging will be incomprehensible.
Wietse
> On Thursday, May 30th, 2024 at 2:34 PM, Wietse Venema via Postfix-users
> <postfix-users@postfix.org> wrote:
>
> > Mailman29 via Postfix-users:
> >
> > > Well the logs say this, which doesn't help.
> > > May 30 14:01:02 mail2 postfix/smtp[1390778]: C5DCBA0501:
> > > to=prvs=1880817b8e=myem...@somedomain.com, relay=none, delay=5.2,
> > > delays=0/0/5.2/0, dsn=5.4.6, status=bounced (mail for somedomain.com
> > > loops back to myself)
> >
> > On the contrary, it says that you have configured a mailer loop,
> > or that you have two different mail services that use the same MTA
> > name (in Postfix parlance, the MTA name is the myhostname setting).
> >
> > > The domain and the postfix server do share the same IP (haproxy
> > > server), but if Postfix would deliver the bounce message it would
> > > get passed through the proxy to the mail server backend. Is there
> > > a way to force this?
> >
> > 1) If the Postfix machine is a front-end for a backend server, then
> > Postfix must be configured as a mail gateway, and there should be
> > a transport_maps setting that routes mail for the domain to the
> > backend instead of sending it to the public internet address. See
> > https://www.postfix.org/STANDARD_CONFIGURATION_README.html#firewall
> >
> > 2) If your Postfix server is behind an inbound proxy server, then
> > you MUST specify the external address with main.cf:proxy_interfaces,
> > so that Postfix will know that it should not try to connect there.
> > https://www.postfix.org/postconf.5.html#proxy_interfaces
> >
> > 3) If you really have more than one mail server, then they must
> > have different MTA names (In Postfix parlance the MTA name is the
> > myhostname setting).
> >
> > Wietse
> >
> > > On Thursday, May 30th, 2024 at 1:46 PM, Wietse Venema via Postfix-users
> > > postfix-users@postfix.org wrote:
> > >
> > > > Mailman29:
> > > >
> > > > > Brilliant! I had a loop with haproxy that pointed it back at my mail
> > > > > server!
> > > > >
> > > > > Now, how do I get postfix to send failures etc to my server? It
> > > > > seems they just disappear into the ether!
> > > >
> > > > Look in your logs: https://www.postfix.org/DEBUG_README.html#logging
> > > >
> > > > If you don't understand an error or warning message, report the
> > > > problem on the postfix-users mailing list.
> > > >
> > > > Wietse
> > > >
> > > > > Sent with Proton Mail secure email.
> > > > >
> > > > > On Thursday, May 30th, 2024 at 12:50 PM, Wietse Venema via
> > > > > Postfix-users postfix-users@postfix.org wrote:
> > > > >
> > > > > > Mailman29 via Postfix-users:
> > > > > >
> > > > > > > HI guys.
> > > > > > > I'm having an awful time getting postfix to work in one form only.
> > > > > > > Accept mail from one ip address only, regardless of the sender's
> > > > > > > domain name, and send it out to the recipients. Postfix has no
> > > > > > > accounts, and accepts no incoming mail. It's only for sending from
> > > > > > > my local server.
> > > > > > >
> > > > > > > Here's my main.cf, as you can see I have it set up to accept mail
> > > > > > > from my IP address only, but every time I try to send mail through
> > > > > > > it I get the error : (somedomain.com is placeholder for my FQDN)
> > > > > > >
> > > > > > > --> EHLO mail!
> > > > > > > <-- 250-relay.somedomain.com Hello mail [IPaddress], pleased to
> > > > > > > meet you
> > > > > >
> > > > > > THAT IS NOT Postfix. You can tweak settings and it will have no
> > > > > > effect,
> > > > > > because you are not taking to Postfix.
> > > > > >
> > > > > > I suggest that you look in the maillog file to fid out what
> > > > > > program is answering the connection..
> > > > > >
> > > > > > Wietse
> > > > > > _______________________________________________
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