A worthwhile note is that, at least in my experience, the messaging
there can be a bit misleading. I've removed my old blog where I proved
it with logs, but what it basically amounted to was this: I have many
times received that exact error, and had the next email accepted by
their systems less than 5 seconds later. So my tests have shown that it
can mean that a portion of the network is blocked, that the IP is
blocked, and also that the single email was rejected. In any case the
course of action is the same, but I found the variation of potential
causes to be informative. This is the form I fill out:
https://support.microsoft.com/en-us/supportrequestform/8ad563e3-288e-2a61-8122-3ba03d6b8d75
Though I've heard of similar success with a simpler form:
https://sender.office.com/
We have better experts with MS on the list than myself, but hopefully my
experience is worthy of a bullet point at least.
On 2021-12-06 13:42, Daniele Nicolodi via mailop wrote:
Hello,
is outlook.com blocking all Linode IPv4 space or am I just unlucky?
eur.olc.protection.outlook.com[104.47.18.225] said: 550 5.7.1
Unfortunately, messages from [109.74.203.128] weren't sent. Please
contact
your Internet service provider since part of their network is on
our block
list (S3140). You can also refer your provider to
http://mail.live.com/mail/troubleshooting.aspx#errors.
[VI1EUR06FT017.eop-eur06.prod.protection.outlook.com] (in reply to
MAIL
FROM command)
What is a good neighborhood to park a mail server these days?
Cheers,
Dan
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