German SMTP IP range on MS block list Wednesday 12th May 2021 23:02:00
We've received some reports that outlook.com and other Microsoft mail services are blocking smtp.de.opalstack.com.
We're investigating now and will follow up when we have more info.
Microsoft is now accepting mail from smtp.de.opalstack.com.
We've identified and corrected the cause of the block, and have passed our findings along to Microsoft with a request to delist the German SMTP address.
We'll update this post when Microsoft have confirmed that the server is no longer on the block list.
