Retrying from a different IP is exactly the wrong thing to do to a
greylisting implementation. Despite the fact that I know a number of
ESPs do this.
Basic greylisting is to tempfail the first attempt from a given IP of
the "same email", because almost all spambots try once and give up.
The implementor can "embellish" that with all sorts of additional
heuristics - automatically identify "good ips", and allow them in
without greylisting, identify "bad ips", and turn it into a blacklisting
with (effectively) tarpitting, identify bad ranges ("all trying to send
me the same failed-greylisting shit!") etc.
Some mail systems are like sysadmins who are in turn like grizzly bears
- poke them too many times they get annoyed, even if you're offering
them yummy raw meat. As I've been telling senders for years, if your
mailer behaviour causes the MTA's, let alone the sysadmin's notice,
you've lost already.
At this point I can only suggest figuring out whether it's "just you" or
not, by trying to send someone there an email from somewhere completely
unrelated.
Then try to contact their sysadmin.
On 2021-04-21 06:23, Neil Youngman via mailop wrote:
> On 21/04/2021 11:00, Chris wrote:
>> Aside from the possibility that the message is simply wrong, or the
>> implementation broken, is your mail server acting like most other
>> servers when presented with a failure (soft or hard)?
>>
>> Your posting seems to be that you give up after the second try.
>>
>> Most servers will try at least 5 times for such, only giving up after
>> hours (sendmail defaults at 4 days).
>
> It doesn't behave exactly like a normal mail server, but it does retry
> more than five times. Not all retries are from the same IP, but I have
> observed that retries from the same IP don't get delivered.
>
> Neil Youngman
>
>
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