I have an Office 365 account. With that account I have 1 email address. Can I create additional email addresses within that one account?

The reason I want this is to avoid giving my primary email address to anyone I do not 100% trust, such as many online retailers and even more discussion boards, like this one. I have actually not had a problem with this board, but I have had with others.

For years, I have used the Spamex service. For something like $20/year, it lets me create 1,000 DEAs (disposable email addresses). If I am about to give my email to a new entity that I do not (yet) trust, I just go to Spamex, create a new DEA, and give that to the new entity. If they send me any email, it goes to Spamex first who then reroutes it to my real email address.

When I create each DEA, I enter the name of the entity that I will be giving it to. If I get spam, I just have to check with Spamex for the name of the entity. I can then turn that DEA off or delete it and, presto, no more spam from that source or anyone they may have given it to.

I probably have 200-300 hundred DEAs. Periodically, I go through them and delete the ones that have had no traffic for a long time.

This has worked well for a long time. Unfortunately, I guess it has also been used by spammers, because I am getting more and more rejections when I try to create an online account using a Spamex DEA.

So I am wondering if there is something comparable that I can do with my Office 365 account? Can I create temporary emails address like xyz@outlook.com? If so, how many?

I believe I heard that gmail has a feature where you can add a "+suffix" to your real email. So if my real email is sally@gmail.com, I can send an email to sally+xyz@gmail.com (or something like that). I think gmail then creates a random email address that contains neither "sally" nor "xyz" and send it that way. If they reply, gmail sends it to my sally@gmail.com account.

Is there anything like that with Office 365 accounts? If so, how does it work or where can I read up on it?

If not, is there another Spamex-like service that does?

Thanks