On Mon, Jan 27, 2014 at 03:53:19PM -0500, Wietse Venema wrote:
> > Before inventing new lookup mechanisms, have you considered the
> > possibility of making the existing mechanisms available for LMTP?
> >
> > - Using multiple A records per name? If all hosts are equivalent
> > that would be the way to go.
>
> This can also be used to implement unequal preferences, by listing
> an IP address multiple times. Postfix will by default randomly
> shuffle the address list.
Perhaps, but see below:
> > - Using MX lookups, and multiple MX records per name? This would
> > make sense if some hosts are more preferred than others.
>
> This requires some SMTP client code duplication. because MX lookups
> are not part of the LMTP protocol spec.
Indeed, MX records are out scope for LMTP. To load-balance LMTP
in a manner similar to MX records would require SRV record support.
Which would (hypothetically) also take care of any desire for
weighting. I am not eager to add SRV support, but it is doable
in principle.
--
Viktor.
