Am 11.01.2022 um 20:04 schrieb Mark G Thomas via mailop:
I'm not generally involved in our support issues, but a coworker at
my work (Linode) reached out to me about what looks to be a new problem
involving hosting customers being blocked by by Microsoft.
It's nice to see another representative of a webhoster brave enough to
post on here, welcome :)
I've been dealing with blacklist issues at Hetzner for the past 6 years,
and I've posted on here multiple times with my experiences. My first
post was actually about Microsoft. If you check the archives you'll find
some posts over the past few months with general information on
Microsoft and blacklists, but I can repeat some of that here that nobody
has mentioned yet.
Since your issue is with Microsoft, it would be good to figure out which
of their blacklists your IPs are on. The error you posted is for the
Office365 blacklist, while the error one of your clients posted is for
the Outlook blacklist. Those are two separate blacklists with separate
processes for getting IPs delisted.
If you're mostly dealing with Office365 then I can only wish you all the
best. We've had very few issues with this blacklist, which I'm thankful
for since there doesn't appear to be much that can be done, other than
emailing delist@.
As for Outlook, delisting IPs is done through a form, and it works most
of the time, though often you will need to escalate the ticket. If you
haven't already done so, make sure you sign up your network in the
Microsoft SNDS. That will show you all of the IPs currently on the
Outlook blacklist. It also shows you (daily) all the IPs that sent over
100 emails to Microsoft accounts, including how many emails, the
complaint rate, and trap hits. Incredibly useful (and free!) information.
Some additional information on the Microsoft blacklists and services
they provide can be found in our docs:
https://docs.hetzner.com/robot/dedicated-server/troubleshooting/microsoft-blacklist/
As for the general issue with blacklistings, depending on how
constrained you are by management (trust me, I get it), there are a
number of things you can look into.
For example, Spamhaus has a list of IPs on their public SBL, some of
which go back a year:
https://www.spamhaus.org/sbl/listings/linode.com
If you haven't already done so, you can sign up for their PBL account,
and that way you can see all of the IPs in your network that are listed
on their various lists. Like the SNDS, this is provided for free and is
incredibly useful.
Also, while it looks like you paid UCEPROTECT to delist all of your IPs
last week, your entire network is back on the level 3 list, and the
trend doesn't look positive. Thankfully though, they show you exactly
which IPs are causing this (scroll down to the bottom and click the
relevant link):
https://www.uceprotect.net/en/rblcheck.php?asn=63949
Finally, make sure you're signed up for as many blacklist reports
(mainly SpamCop and SORBS) and FBLs (mainly through Validity) as
possible. There's an interesting dicussion on here right now regarding
how to handle FBL complaints, so it would make sense to look into that
as well. The more information you have, the better.
I'm assuming you've already done some if not most of what I wrote, but I
wanted to at least cover the basics.
I hope that made sense and I hope you are able to resolve the issues you
are facing.
Regards
Bastiaan
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