On 16/10/2021 11:44, Grant Taylor via mailop wrote:
On 10/15/21 7:11 PM, Dave Crocker via mailop wrote:
Let's try I again. I said "for these two functions".
The original query, as noted in the Subject line, is for IMAP and
SMTP.
How does reputation for SMTP activity interact with IMAP activity?
And what does reputation mean, relative to IMAP activity?
I can see a hypothetical scenario where a client is running a firewall
that is filtering connections based on IP reputation. So if an SMTP
server is erroneously listed, said firewall might block the IP, thereby
blocking the client's access to the IMAP server if it was on the same
IP as the SMTP server.
But that surely is the mail operators fault, if an abuser on say 25 or
587 results in everything being blocked, that's too heavy handed and
they accept the end result for their paranoia.
I use a more measured heavy handedness ;)
if one abuses any of 25|465|587 they are blocked on all of 25/465/587
with a lengthy filter time
if one abuses any of 110|143|993|995 they are blocked on all of
110/143/993/995 with a slightly shorter filter time
Not saying its perfect or ideal, as always YMMV, but it's worked well
enough for me for many many years.
O.P
I used to run separate ip's and names way back in the day, but in the
end, it did cause CSR's more grief, so for past 15 years or so using
just mail.domain removed most of it, and yes as someone else mentioned
earlier, when you need to scale, load balancers, that's what they were
designed for :)
If you get biggish though it helps to keep the mx side of things
separate though using its own name and perhaps behind its own LB too.
You don't need to go out and buy one of the criminally overprices "brand
name" things that cost 10's to 100's of thousands, maybe if you get to
size of Microsoft or google you might, but for most of us here, nah, our
2 LB's cost about 4K each, but that was a while back :)
--
Regards,
Noel Butler
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