> On 13 Jan 2023, at 16:22, Gerben Wierda <gerben.wie...@rna.nl> wrote: > > I have created a second postfix server in my LAN. The idea is to use both in > a failover/loadbalancing setting for now. At the back are two dovecots that > replicate to each other. > > When mail is sent out via my router, it picks up anything that goes out to > port 25 and makes sure it comes from mail.rna.nl <http://mail.rna.nl/> > (source NAT). > > In the single mail server, I have: > > main.cf:myhostname = mail.rna.nl <http://mail.rna.nl/> > > which creates a HELO that fits the reverse DNS of mail.rna.nl > <http://mail.rna.nl/> because of that source NAT. That works. > > But now I have two mail servers, say, internally they are called a.rna.nl > <http://a.rna.nl/> and b.rna.nl <http://b.rna.nl/> > > I can have both configured like this: > > main.cf:myhostname = mail.rna.nl <http://mail.rna.nl/> > > or I can have both configured like this: > > main.cf:myhostname = a.rna.nl <http://a.rna.nl/> > main.cf:smtp_helo_name = mail.rna.nl <http://mail.rna.nl/> > > is there a reason to do one or the other?
Answering myself: myhostname = a.rna.nl smtpd_banner = mail.rna.nl smtp_helo_name = mail.rna.nl is an easy way (I had forgotten about smtpd_banner) G
