I set the following in main.cf:
smtpd_relay_restrictions = permit_mynetworks, reject
Which, if I understand correctly, should mean that any email coming from
addresses specified in mynetworks will be accepted, while all others get
rejected.
Mynetworks in my case only specifies loopback addresses, so my SMTP
server will accept email from localhost and reject all others.
If you have different needs you should look into the links sent by Bob
earlier in this thread, there's quite a number of possible policies
available.
/T
On 2020-10-02 19:55, Ranjan Maitra wrote:
Hi,
Thanks, I am not very knowledgeable with regard to postfix being a
simple user, so do you mind letting me/us know what you had to fix? It
is kind of forbidding to me.
Thanks again and best wishes,
Ranjan
On Fri, 2 Oct 2020 15:52:34 +0200 Erik Thuning <thun...@dsv.su.se> wrote:
> Thank you! I had this exact issue and just couldn't wrap my head around
> what was wrong, this solved things quite nicely.
>
> /T
>
> On 2020-10-02 00:00, Bob Proulx wrote:
> > Ranjan Maitra wrote:
> > > > > Oct 1 14:08:00 localhost postfix/smtpd[4142479]: fatal: in
> > parameter smtpd_relay_restrictions or smtpd_recipient_restrictions,
> > specify at least one working instance of: reject_unauth_destination,
> > defer_unauth_destination, reject, defer, defer_if_permit or
> > check_relay_domains
> > >
> > > My apologies: how do I do this/what should I do here?
> >
> > Since you haven't shared your postfix configuration but just parts of
> > it in the master.cf then we can only point to the documentation.
> >
> > Start here and read these:
> >
> > http://www.postfix.org/postconf.5.html#smtpd_relay_restrictions
> >
> > http://www.postfix.org/postconf.5.html#smtpd_recipient_restrictions
> >
> > What is the value of these for you? This will produce some output
> > which shows the current configuration.
> >
> > postconf smtpd_recipient_restrictions smtpd_relay_restrictions
> >
> > For my use I leave smtpd_relay_restrictions set to the default value
> > and then set smtpd_recipient_restrictions. That's one valid
> > combination. But there are others.
> >
> > At the least I would think something like this:
> >
> > smtpd_recipient_restrictions =
> > permit_mynetworks,
> > reject_unauth_destination,
> > reject_invalid_hostname,
> > reject_non_fqdn_hostname,
> > reject_non_fqdn_sender,
> > reject_non_fqdn_recipient,
> > reject_unknown_sender_domain,
> > reject_unknown_recipient_domain
> >
> > But in real use I have a much longer list with a lot more there for
> > blocking spam and other things. You should understand it before using
> > it and adjust it as needed for your environment.
> >
> > Bob
>
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