When comparing Anonaddy vs Firefox Relay, the Slant community recommends Anonaddy for most people. In the question“What are the best email forwarding services?” Anonaddy is ranked 1st while Firefox Relay is ranked 3rd.
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Pros
Pro Multifactor authentication is available
Pro You can make your unique custom alias
For example, if you are on xyz.org and you want to sign up to their newsletter you could simply enter xyz@johndoe.anonaddy.com (or .me).
johndoe represents your unique username.
Anonaddy automatically creates the alias in your dashboard as soon as it receives its first email.
Pro Browser extension available
Pro 2 Recipients
Pro Unlimited aliases
Pro PGP/GPG encryption
Pro It is free
Pro Catch-all subdomain
The premium plan gives you a subdomain that creates aliases as soon as mail is received.
Pro FOSS
As a Mozilla product, it's open source.
Pro Cheap
Free plan gives you 5 random aliases while the premium plan gives you unlimited at just $1.
Pro Simple
Easy to use and clean UI.
Cons
Con You can't reply from these emails until you upgrade to paid plan
Con Only 10 MB bandwidth in one month
Con Only 20 active aliases at a time, for more you have to pay
Con No custom domain support
There is no option to bring your own domain (unless you self-host).