Unfortunately, this has become completely normal behaviour. For about
nine months now, filling out the postmaster form has yielded no
information, or rather, it always informs us that the IP is not blocked.
Only after manually requesting information via email do we receive the
information that the IP has either been unblocked or cannot be
unblocked. All attempts to obtain more information have failed. We have
been in the JMRPP programme for years, but the information it provides
is very limited.
I suspect that there are several block lists with different levels.
Anything else would be unusual. We have also noticed that this always
happens in waves. We have no problems for months and then several IP
addresses are affected at once, even though the amount of emails we
deliver has not changed.
Kind regards,
Holger
On 25/07/2025 17:39, Stefan Neufeind via mailop wrote:
Hi,
I recently had conversation through various channels with Microsoft
regarding a blacklisting happening in Europe with their OLC (outlook
consumer) protection-gateway for a specific IP-address being blacklisted.
First, let me stress that after finally having reached a right team the
Microsoft-support was very helpful and friendly. They helped resolve the
case in short time.
It still frightens me to see how intransparent such blacklistings
happen. For good cooperation among ISPs we were in their JMRP program
(junk-mail reporting program) for a long time - but haven't received
feedback about this case. Using their support-forms for IP-delisting the
first automated response was that IP was not blacklisted at all -
although the SMTP-errors clearly showed that based on the IP a
blacklisting happened.
Does someone know if there are multiple blacklists being used inside
Microsoft? Are there any chances to query blacklists to more easily/
quickly learn about blacklistings that happen? Why is JMRP not used or
maybe only for certain recipients? And why do forms report there are no
active blacklistings - when after having reached a human through the
same way they confirmed the blacklisting was removed?
When asking again as a follow-up about how the blacklisting could have
better be detected and reported etc. to improve cooperation I got:
I do apologize, but I am unable to provide any details about this
situation since we do not have the liberty to discuss the nature of
the block.
I don't blame the support person at all. They are not allowed to discuss
details. But why is there so little cooperation between large mail-
operators to mitigate problems, to proactively communicate (as was the
intention of the JMRP I guess) and to work closely when something
happens to stop any errors early instead of waiting for problems to
escalade?
Kind regards,
Stefan Neufeind
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