Microsoft Outlook, Hotmail blocking emails

[Allyance]

I have had a small web hosting and email service for years for my network clients. Most of my accounts are now gone but I have one client who is a lawyer who uses his email associated with his domain quite extensively. For the last couple of weeks we have had our emails returned by Microsoft with the following error message: "Please contact your Internet service provider since part of their network is on our block list (S3140)". Key word is "part" or subnet. My hosting company uses shared servers to a common IP. Thinking that was the problem, I opted for a dedicated IP at a cost of $48 per year. That fixed the problem with Microsoft for about a day. Microsoft will not give public access to their block list and fight tooth and nail the remedy the situation (they do have forms, but slow to respond). All searches for blacklisted site come up clean.
Anyone using private email servers beware, a real hassle to pin down and fix.

 

[BrianBaughn]

Anyone using private email servers beware, a real hassle to pin down and fix.

I don't doubt it!

I suggest getting that client out of your email hosting and moving him to something that MS can't muck up.

 

[1129846]

Has your email hosting gotten their server blacklisted? Could they also be hosting a spammer so that entire mail server got blacklisted so it kills all the mails from it or some how you some how accidentally sent an email to a honey potted address.

 

[Allyance]

Has your email hosting gotten their server blacklisted? Could they also be hosting a spammer so that entire mail server got blacklisted so it kills all the mails from it or some how you some how accidentally sent an email to a honey potted address.

Been through all that, that is why I bought a dedicated IP just for server. My IP does not appear on ANY blacklist. My domain is the only one associated the IP. Microsoft is not blocking any specific address or domain, only claiming that a subnet of my IP does not pass their strict rules. Microsoft will not reveal their blacklist, instead they will punish any user on my IP's subnet for something that does not apply to them. It is like having your street blocked because one house doesn't comply with some ordinance, but they won't tell you which house.

 

[Allyance]

Problem solved, MS mitigated the problem and cleared my IP.

 

[ian87w]

Problem solved, MS mitigated the problem and cleared my IP.

Glad that worked out.

Some institutions in my country couldn't/wouldn't want to deal with Microsoft blocking their domains/IP/server/whatever that they just tell people to use GMail.

 

[ivanwi11iams]

Problem solved, MS mitigated the problem and cleared my IP.

That was nice of them. And have they confirmed that this will not happen again, or?