Hi Marco
Same here, randomly refused with exactly same situation, no data on SNDS and MS
support says the same
Cheers
Salvatore
From: swinog-boun...@lists.swinog.ch on behalf
of Marco Kälin
Sent: Tuesday, November 16, 2021 9:14:02 AM
To: swinog@lists.swinog.ch
Subject: [swinog] Problem sending to hotmail / block list S3150
This is the first time you've received an email from this sender. Make sure
this is someone you trust.
Hi @ all
Actually we have massive problems sending to private microsoft customers
(hotmail.com, live.com, etc.)
We offer some small smtp mailservices for our customers (smtp smarthost and
also a mail encryption and sign service).
The standard configuration of our outbound smtp servers is from my point of
view set correctly:
* Fix IP
* Correct SMTP Banner, HELO, RDNS
* A Records matches RDNS
* SPF Records pass
* Tested DKIM signed
* Not on any Blacklist (checked with mxtoolbox.com)
* No spam activities on this /24 ip range for at least 6 years
* Sending to Microsoft Office 365 (Business Customers) works.
We registred our IPs on the Microsoft Smart Network Data Service (SNDS).
This only reports "All of your IPs have normal status".
The MS Support "does not see anything that would preventing your mail from
reaching our customers". But it's MS servers that bounce the mail...
Remote Server returned '554 5.7.1 http://mail.live.com/mail/troubleshooting.aspx#errors.
[DM6NAM04FT044.eop-NAM04.prod.protection.outlook.com]
Has anyone experince with this sort of problem?
thanks and great day.
Marco
Freundliche Grüsse
Marco Kälin
+41 79 177 11 76 | marco@kaelin.email
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