Hi,

I meant that you specify a value as a *number* like this:

"relay backup 20"

and then, the backup server would relay to all MXs where the value is
lower than 20. However, since you didn't specify a value (which, as I
read it, should be a number), all mail gets relayed via the default
server name.

Cheers,
Michael



On 2 November 2015 at 09:25, LÉVAI Dániel <[email protected]> wrote:
> Michael Morak @ 2015-11-01T18:40:01 +0100:
>> Hi Daniel,
>>
>> as far as I've seen from the manual, the syntax is "relay [backup
>> [mx]]" and the description says: "Accepted mails are only relayed
>> through servers with a lower preference value in the MX record for the
>> domain than the one specified in mx. If mx is not specified, the
>> default server name will be assumed." <- I read this to say "If mx is
>> not specified, relay to the default server name."
>
> Hm, not quite. It says that it relays the mail to a server *with a lower
> preference value* than the one specified as mx, or got from other sources
> (mailname, gethostname(3), etc...). And that is what it should do, because
> the mx1 will have a lower preference, than the mx2 (and I'm configuring
> the mx2).
> Unfortunately, it doesn't act per the man page; it seems it doesn't do
> the MX lookup, and relays through itself again and again...
>
>>
>> Further on in the manual it says this:
>>
>> "/etc/mail/mailname  If this file exists, the first line is used as
>> the server name. Otherwise, the server name is derived from the local
>> hostname returned by gethostname(3), either directly if it is a fully
>> qualified domain name, or by retrieving the associated canonical name
>> through getaddrinfo(3)."
>>
>> I guess, since you didn't supply an mx value, OpenSMTPD tries to relay
>> mail to the default server name, which in your case seems to resolve
>> to the server running the backup MX (which is not unusual, and one can
>> argue whether this is therefore a good default for the "backup" option
>> without an "mx" value supplied).
>>
>> TL;DR: I guess you need to supply an mx value in your smtpd.conf for
>> this to work as intended.
>
> Again, even if I had specified a value for 'mx', it must've only routed
> the the mail through a server with a lower preference number. So if I
> had specified mx1, then there wouldn't have been any servers that are
> with a lower pref. value, in turn, if I had specified the mx2, it
> would've acted like the same as with the default value.
>
> Daniel
>
>> On 1 November 2015 at 13:57, LÉVAI Dániel <[email protected]> wrote:
>> > LÉVAI Dániel @ 2015-10-31T10:24:35 +0100:
>> >> Hi!
>> >>
>> >> I'm trying to setup a simple backup mx on OpenBSD 5.8-stable, but so far
>> >> it seems more of a burden than a "simple" task :)
>> >>
>> >> smtpd.conf:
>> >> ------------------------8<------------------------
>> >> pki hostname certificate "/etc/ssl/smtpd_cert.pem"
>> >> pki hostname key "/etc/ssl/private/smtpd_key.pem"
>> >>
>> >> listen on pppoe0 tls pki hostname
>> >>
>> >> table aliases db:/etc/mail/aliases.db
>> >>
>> >> accept for local alias <aliases> deliver to mbox
>> >>
>> >> accept from any for domain "example.com" relay backup tls verify expire 
>> >> 30d
>> >>
>> >> accept from local for any relay
>> >> ------------------------8<------------------------
>> >
>> > Alright, so the backup mx handling is clearly broken in opensmtpd.
>> > Using "relay via" instead of "relay backup" works:
>> >
>> > accept from any for domain "example.com" \
>> >         relay via "tls://mx1.example.com" pki hostname verify \
>> >         expire 30d
>> >
>> >
>> > Anyway, it would nice to hear some words on this from one of the devs.
>> > Is this intended? How can one debug this further?
>> >
>> >
>> > Daniel
>> >
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