Recently, I started getting lots of spam emails to (mainly) an alias to my Outlook.com account. Those spam emails are not caught my Outlook.com spam filter and end up in my Inbox (I get more than 20 every day). Most of these emails are obviously spam; e.g., emails without content, emails with weird fonts in the subject, or emails that reach my inbox and they are "important" flag already set!
I tried blocking the sender, but those spammers are "smart" enough to use different sender email every time. I also added the SMTP server to the blocked senders' list, but that did not have any effect.
Given that I would like to keep the alias:
- What options do I have to block those spam emails? Or,
- How to block all emails to this alias, except if they are from "known" senders?