Hi all,
I'm sure we've all seen this before (I'm fairly sure I have), but I
can't for the life of me figure out what to do to fix it.
The error in question: host eur.olc.protection.outlook.com[104.47.13.33]
said: 550 5.7.1 Unfortunately, messages from [195.246.200.38] weren't
sent. Please contact your Internet service provider since part of their
network is on our block list (S3150).
I am *fairly* sure 195.246.200.38 is a member of a valid, assigned IPv4
block in RIPE (at least, WHOIS says it's OK), has reverse DNS to
greyhound.dchosted.net (which has an A record back the other way), and
cannot see any logical reason why this would be blocked.
This was working two days ago (as I exchanged emails with a customer at
22:16/22:18 on Saturday night), and now has suddenly stopped and I get
the above message.
I would welcome anyone who can tell me what their mail server doesn't
like about my outbound mail IP. I can send emails to most customers
absolutely fine, including customers on Office 365, but cannot send
email to @live.com, @hotmail.co.uk, etc customers.
Thanks in advance.
Regards,
Chris Malton
--
Delta V Technologies Limited
03333 402 406 www.deltav-tech.co.uk
Office: 17 Elm Close, Southampton, SO16 7DT
Company No. 11006104 Registered in England and Wales
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