*Unlimited* Disposable Email Aliases
Startmail explains it perfectly. They offer unlimited disposable aliases, which expire within a given amount of time. They also offer custom aliases which can be saved and used indefinitely.
It is the disposable alias which will help protect privacy, when submiting an email to an untrusted recipient. After all, how much privacy do we have if our fixed emails become the foundation for building and selling our marketing profiles, just as is done by gmail. We limit personal activity virtual trails by disposing of aliases for casual uses. But, unlike custom aliases, which build on our identifiable original email address, disposable aliases divert from our true email identity by utilizing a sub-domain created for this specific purpose, such as: xxx@tda.protonmail.com (tda = temporary disposable alias)
You avoid abuse by limiting disposable alias creation on a daily basis. Perhaps 5 max per day.
Here is Startmail's explanation:
https://support.startmail.com/index.php?/Knowledgebase/Article/View/3/0/aliases
The Blur service (by Abine) also offers a "masked mail" free service. But their service is not encrypted:

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Noa commented
Offer a way to easily create temporary emails (with random usernames so that we can sign up for services without sharing our personal email) / "relay" emails (like the Firefox Relay service)
Having everything in one place and quickly accessible would be amazing
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Jenny commented
When it comes to secure email, this seems like a no-brainer. I would love to see Proton do what Fastmail and 1password are doing together!
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ali commented
Proton already offers this feature in 2 places.
1. Catch-all email in Proton Unlimited plan
2. Paid plan of SimpleLogin.If you already are a paying customer and don't want to pay for 1 more subscription, 1st option if for you. After setting up catch-all email with custom domain, you can use any username@yourdomain.tld as alias without setting it up in settings as another address.
If you want unlimited alias without adding custom domain, then I am sorry but you have to use a service which specialises on email alias, such as SimpleLogin or Firefox Relay. Firefox Relay is the cheaper option.
I'm gonna vote for "Not at all" because even though proton mail isn't for managing aliases, it does offer that feature, albeit some setup by user is required.
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J commented
I was really hoping that with the newest update they would surprise us with unlimited aliases since they acquired SimpleLogin. I really like the new VPN service, but it is expensive to pay for proton unlimited and another service like StartMail. StartMail is better since it is a singular product and I don't have to do extra steps to initiate a conversation using an alias like I would with SimpleLogin. This is the new way of doing email and if Proton doesn't start listening to it's customers it is going to lose out to StartMail. With over 14,000 votes and it is still under review. They better figure out something or I'm going to have to move on from their email. I can't get anonymity with 15 addresses.
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LL BB commented
This move suggests it will likely be coming:
https://protonmail.com/blog/proton-and-simplelogin-join-forces/ -
Billbo746 commented
Fastmail has masked emails and they work fantastic with 1password! Would absolutely love if Proton would do the exact same!
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Anonymous commented
if the url changes, sites will block it as a "disposible"
a better way would just be for protonmail to generate random long usernames that no one will ever want (this would save from pool of good usernames being used) example 23487gqerjk2347@protonmail.com -
Robert commented
Yea I really wish I had an email relay feature like SimpleLogin, Firefox Relay, or Apple Private Relay integrated into ProtonMail. That would make perfect sense for this product!
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Luis Daniel commented
The integration of 1 Password with FastMail on this idea is a great plus. Wish I could do the same with ProtonMail.
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D commented
Love the idea. I use mailgw.com which is great!
I make one alias for each online account, so I can dispose any abused email
And track the guilty database / service -
Anonymous commented
Any updates here? This has been open for nearly 5 years now, and under review for 4?
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Anthony Lei commented
Duckduckgo is launching an email protection service, we need to step up the game and implement this feature!
https://www.spreadprivacy.com/introducing-email-protection-beta/ -
George commented
Nice idea
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輿水 拓海 commented
That's a great feature. I don't want to use simplelogin anymore. Please include this feature to the freeplan too.
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Name commented
Also with the ability to send email from the alias.
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Matt commented
I'm using simplelogin which is great but it has it's flaws that could be addressed if PM integrated a similar function.
The reverse -alias address that comes from simplelogin is long and meaningless. If Pm integrated this function than the send address could still be the original sender address rather than a masked alias. -
Rick commented
I am not sure why protonmail hasn't implemented features like masked mail similar to Blur service by Albine. I checked out Blur services, and the concept is great. Just why should we have to search for these additional mail features from other companies when it would be great if protonmail had these features or as least a roadmap on upcoming requests.
By the way has anyone checked out Sekur? They are a Swiss-based company that offer secured email and chat. They also offer cloud solutions. Would be great if protonmail comes out with a secured mobile chat. If it wasn't for the cost I would drop signal app. They were saying how signal app goes through your contacts and initial setup you have to provide your phone number so overall your privacy isn't so private whereas Sekur doesn't ask for your phone number. You are given a random id.
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Anonymous commented
I'm moving all my emails to proton once this disposable aliases feature and the search tool are ready, otherwise the purpose of trying to keep my online activity private and practical is defeated-
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Publicarray commented
Idealy a user could choose between these options:
* Accept mail to anything@user.domain.com and deliver it to user+anything@domain.com
* Accept mail to user@anything.domain.com and deliver it to user@domain.com
* Reject mail to anything@anything.domain.comAll a user needs to do is add one more MX record for subdomains: *.domain.com 10 mail.protonmail.ch
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No one commented
Even Apple mail now supports burner e-mails, where you can create unique addresses for each service. ProtonMail is starting to lag behind with features unfortunately.