On Sat, Mar 23, 2024 at 3:32 PM Matus UHLAR - fantomas via mailop <
mailop@mailop.org> wrote:

>
> I am curious how do people configure hosts that send mail.
>
> For years I recommended using separate IP address (if possible) to send
> mail
> from such servers directly, so one host getting listed in dnsbl does not
> affect others.
>
> However, if logic like the mentioned one can result into IP being listed
> when a sudden (small) mail peak happens, it would make sense to send all
> mail through one mailhub which sends mail more often, so it has good score
> and does not get listed (but if it gets listed, all mail gets rejected).
>

We follow the route of having centralized mail hubs. Our internal servers
send their emails to a set of (currently) 2 bulky email servers which are
under the same IP & hostname (I believe originally to save IPs). Our rep is
great, but we send hundreds of thousands of emails a day, so we could
likely get away with doing it either way. We do occasionally have smaller
receivers block us, and it is unfortunate whenever mail is rejected, but
for our type of mail it isn't the end of the world, so we attempt to make
contact, and if we can't resolve it, direct the user to contact their
provider.
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