You could use a matching rule to these particular emails and use relay via to
specify the host to send it to. However I would think that their system will
still hop you around. Worth a shot though. You could ask their postmaster to
whitelist you on all of their hosts. Probably the better choice.
>
> On Dec 6, 2017 at 1:43 AM, <Harald Dunkel> wrote:
>
>
> Hi folks, Looking at my opensmtpd log file (see attachment) some EMails are
> greylisted by the peer several times. Apparently the receiving ISP has
> several MX hosts, probably each running its own local whitelist. :-( Do you
> think it would be possible in opensmtpd to avoid hopping from one IP address
> to another, when the greylisted EMails are processed again? opensmtpd is
> version 6.0.2, running on Debian. Every helpful comment is highly appreciated
> Harri
>
