That has usually been our experience as well. There's 2 different
blocklists, and usually it's the Hotmail/free side of things that are
blocking you.
This is the links we have written down on our side.
Office 365: https://sender.office.com/
Hotmail and other other free services: https://olcsupport.office.com/
It's most likely the 2nd one you want.
Our experience is that the first reply seems like an automated system.
It will respond with a similar message saying "We were unable to
identify anything on our side that would prevent your mail from reaching
Outlook.com customers."
It will usually also recommend you sign up to their Junk Email Reporting
program (JMRP) and Smart Network Data Services program (SNDS).
We have already signed up for both, so we usually just reply back that
we're already using both, and a copy of another recent reject message.
Most of the time, that seems to make someone look into it.
If you're already signed up to the JMRP, you should of course look
through reports and figure out what might have caused the block to begin
with, and deal with that before you contact them :)
On 8/18/23 00:28, L. Mark Stone via mailop wrote:
Hi Dan,
To my understanding, the Hotmail side and the Microsoft 365 side
(protection.outlook.com) have different blocklists and different teams managing
them. What has changed recently is (I think I saw posted here) that Hotmail
flow is now getting routed through the protection.outlook.com infrastructure.
Sounds like you got the block notification from the Microsoft 365 side (because
of routing) but perhaps the real block is on the Hotmail side of the house?
All the best,
Mark
_________________________________________________________________
L. Mark Stone, Founder
North America's Leading Zimbra VAR/BSP/Training Partner
For Companies With Mission-Critical Email Needs
----- Original Message -----
From: "Dan Mahoney (Gushi) via mailop" <mailop@mailop.org>
To: "mailop" <mailop@mailop.org>
Sent: Thursday, August 17, 2023 5:41:32 PM
Subject: [mailop] Hotmail's Blocklist and S3150
Hey there all.
Dayjob (ISC -- BIND, F-root, DHCP, those guys) just spun up a new ip block
to put a few F&F/Employee VMs on. We are the ISP -- this is our netblock
space. We've owned this block for a while, just haven't used it recently,
and we've never really used it for *any* spam sending purpose.
One thing I'll note is that it looks *LIKE* an RFC1918 ip, but it's not.
(192.158 versus 192.168).
One of them tried to send mail and got this block message (note,
all domains are intaxct, but I have changed a letter in the uer-portion to
stop it from getting picked up by harvesters).
Aug 16 14:41:20 mail postfix/smtp[7844]: D47CA7A4672:
to=<busanroser...@hotmail.com>, orig_to=<busa...@dragon.net>,
relay=hotmail-com.olc.protection.outlook.com[104.47.56.161]:25,
delay=1.9, delays=0.08/0.02/1.7/0.15, dsn=5.7.1, status=bounced (host
hotmail-com.olc.protection.outlook.com[104.47.56.161] said: 550 5.7.1
Unfortunately, messages from [192.158.252.15] weren't sent. Please contact
your Internet service provider since part of their network is on
our block list (S3150). You can also refer your provider to
http://mail.live.com/mail/troubleshooting.aspx#errors.
[CO1NAM11FT106.eop-nam11.prod.protection.outlook.com
2023-08-16T21:41:20.664Z 08DB9E137B1F64A7] (in reply to MAIL FROM
command))
Aug 16 14:41:20 mail postfix/smtp[7844]: D47CA7A4672:
to=<busanroser...@hotmail.com>, orig_to=<busa...@dragon.net>,
relay=hotmail-com.olc.protection.outlook.com[104.47.56.161]:25,
delay=1.9, delays=0.08/0.02/1.7/0.15, dsn=5.7.1, status=bounced (host
hotmail-com.olc.protection.outlook.com[104.47.56.161] said: 550 5.7.1
Unfortunately, messages from [192.158.252.15] weren't sent. Please contact
your Internet service provider since part of their network is on
our block list (S3150). You can also refer your provider to
http://mail.live.com/mail/troubleshooting.aspx#errors.
[CO1NAM11FT106.eop-nam11.prod.protection.outlook.com
2023-08-16T21:41:20.664Z 08DB9E137B1F64A7] (in reply to MAIL FROM
command))
We reached out to MS, requested a delist, To which MS responded:
===
Hello,
Thank you for contacting Microsoft Online Services Technical Support.
This email is about ticket number [number], which was opened regarding
your delisting request for [192.158.252.15].
It appears that the IP you submitted is not currently listed on any of our
block lists. This may be due to an earlier delisting request that
has already been processed.
If you continue to receive Non-Delivery Receipts (NDRs), or "bounce
messages," that indicate that the IP address is still blocked by our spam
filtering system, please forward one of the messages to us and we will
investigate further.
Thank you again for contacting Microsoft Online Services technical support
and giving us the opportunity to serve you.
====
We are continuing to receive these. Is there some magic incantation I
need to know. Shiboleet! (Help, plz).
-Dan
--
Martin Flygenring (maf)
Systems Engineer, group.one / one.com
_______________________________________________
mailop mailing list
mailop@mailop.org
https://list.mailop.org/listinfo/mailop
