When comparing Pobox vs Firefox Relay, the Slant community recommends Firefox Relay for most people. In the question“What are the best email forwarding services?” Firefox Relay is ranked 3rd while Pobox is ranked 5th. The most important reason people chose Firefox Relay is:
The premium plan gives you a subdomain that creates aliases as soon as mail is received.
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Pros
Pro Has a forwarding only solution
If you need only forwarding, most Pobox plans focus on this.
Pro Supports + tags or + extensions on emails
For instance, david+extension@example.com is supported.
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 Forwarding services starts at $35/year
Con Domain setup requires customer service
Pobox relies on customer service to approve custom domains. During business hours, they are quick to respond but outside of business hours, you're out of luck.
Con UI is old and clunky
This service has been in operation for decades but the UI also looks dated as a result. It's not particularly ugly but it is not particularly nice. However, it is definitely somewhat cumbersome to use.
Con No custom domain support
There is no option to bring your own domain (unless you self-host).