Jan 19 2018 09:03 AM
Jan 19 2018 02:06 PM
There's nothing special about domains with hyphens, you can add it to the spam block list just as any other domain.
Dec 17 2019 10:50 AM
@Vasil MichevBlocking using the Spam section of 365 doesn't block, it just files to the quarantine meaning an email from a domain that you've "Blocked" still needs to be reviewed and dealt with. The only way (I've found anyway) to actually BLOCK a domain is to use transport rules. Transport Rules don't like hyphens.
I can imagine this is what the OP is referring to.