Fastmail has another plus (which no other provider has) its mail client lets you send mail from your random unique email addrso on your domain on the fly. So w

Fastmail has another plus (which no other provider has) its mail client lets you send mail from your random unique email addrso on your domain on the fly. So while catch-all solves the problem of receiving emails on random email addresses on your domain it gets tricky when you have send emails from those addresses. (Apple mail client allows you to do this in a convoluted way - you have to add the email in advance and if you forgot it’ll be sent from another email)