Offer 3 distinct alias types seamlessly within Proton Mail
I pay for the unlimited plan mainly for the SimpleLogin aliases but since using them I've realized there's a benefit to multiple types of aliases and each has its place.
I would love to see Proton Mail offer 3 types of aliases to better compete with Fastmail's aliases and masked emails (they're great!):
Standard alias (or additional email addresses). These are great when you want full control of the address because you may hand it out or it's intended to be used regularly as a receiver and a sender. These are also useful if a service denies the known SimpleLogin alias domains due to them being recognized as "disposable addresses". Ideally, we'd have more than 15. Fastmail gives you 600!
Masked emails (auto-generated) that behave just like the standard aliases above. These are, in my opinion, the most likely used and offer best of what you want for anonymity and usability. You can send from them natively (without a reverse alias) as they are direct aliases to your account. As far as usability, received emails behave like normal emails that would be sent directly to you (without the sender name or subject or profile image being lost or translated). You can send from these from a drop-down list just as if it were a standard alias as well.
Relay alias (the current SimpleLogin offering). This type of alias is most useful for aliasing to other inboxes outside of Proton -say you want to alias emails in front of your Gmail or Outlook account you still maintain.
All 3 types would be assumed to work with custom domains.
Another improvement would be to offer the masked emails and relay types as part of the standard Proton mail domains as a "shared space" to avoid services identifying known alias domains and not accepting them for use. Fastmail and iCloud both do this - aliases and standard users share the same domain name space. It makes it nearly impossible if not incredibly risky for a service to block an address by domain name alone. With SimpleLogin, I've had a few services prevent me from using the alias I supplied because they identified the domain name as a "disposable domain address".
Email aliasing will quickly be recognized by everyday users increasingly becoming more aware and protective of their privacy as a must-have essential feature. If a service offered all three types it would be recognized as a gold standard offering in my books.
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jsnfld commented
Having a masked email, using a custom domain that can be created without logging into computer, because maybe I was asked to give my email address over the phone and I want to control spam. For example, salescall@customdomain.com.
This service is available today using Mozilla Relay, and having it part of ProtonPass where I don't have to use a "+" symbol as part of the email alias, and is permanent so I can create a login, with a password later (if desired)