Fastmail also lets you use aliases to protect your main address. I only give out an alias with an alt domain - something like spam@jm4.eml.cc, linkedin@jm4.eml.

Fastmail also lets you use aliases to protect your main address. I only give out an alias with an alt domain - something like spam@jm4.eml.cc, linkedin@jm4.eml.cc, etc. No one has my real address. I basically only use it as my username. I give an alias to family. I just delete the alias or filter it to the trash if I have problems with it. I'd be surprised if many harvesters are going to bother with rules just for Fastmail domains. First of all, they have a bunch of them. Second, the spammers' objective is to get email into your mailbox. They don't care if they use an alias to get there. Bad actors who got your info in a data breach are a different story, but there's probably some safety in numbers. There could potentially be millions of accounts to go after before they start thinking about reversing my Fastmail alias. Besides, if you use one of the generic ones like qq.com or eml.cc - or even better yet, your own domain - they're not likely to notice anyway.