outlook.com

About

Exclusionism

Microsoft's email servers, most notably those handling incoming email for outlook.com, tend to block email from unknown IP addresses by default. Worse, the email is not be returned with an error message but is silently ignored; the only way to determine that this is what is happening is to enable "delivery status notification" when sending an email, which is not supported by all email clients.

Notes

2019-10-23

This seemed like it was a way to request unblocking of a given email-sending IP address, but apparently it isn't:

• https://sendersupport.olc.protection.outlook.com/snds/addnetwork.aspx

Caveats:

• approval request can only be sent to an admin email address assocated (somehow) with that IP
• implicitly only unblocks for the user making the request?

To be researched.

2019-10-24

• no date? How to Remove Your IP Address from the Hotmail/Outlook’s Blacklist