*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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[Deleted User] commented
You can use SimpleLogin for unlimited disposable email aliases if you have a pay plan.
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Jonas commented
Give all features of simplelogin in Protonmail because simplelogin is blocked on many websites as they consider it a disposable mail service
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Ddnzzachir Sulaksana commented
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AET commented
This is ABSOLUTELY CRITICAL. You now have Simplelogin, so WHY can't this feature be managed WITHIN the proton mail service? Why do i have to go through another company, platform and mobile app to manage this?
Even damn YAHOO with their paid plan offers 500 "disposable email" addresses which you can create and delete at will, from inside the mail client...PLEASE INTEGRATE THIS
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Ethan Allen commented
We need the ability to have unlimited full feature addresses. Simple Login / AnonAddy are great BUT they aren't preferred for important accounts and I have quite a few ( Banks, taxes, healthcare, insurance, work, etc ) that need real addresses and this 15 address limit is ridiculous. What happened to the 50 addy limit?
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Drew commented
This should be marked as complete, right? We have Simple Login now, which does exactly this.
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A commented
Currently, I use a catchall which works poorly. Please create low-friction on-the-fly aliases and coordinate with 1password to integrate them into their website account creation and login process. I understand that a proton password mgr is in the works but for me that is a hard sell. 1password has been around a long time and has a perfect security record. Passwords are critical. Even though I love Proton, there is no way I'd risk my passwords to a new password manager.
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StardustApe commented
SimpleLogin is now included in the Unlimited plan. Should be marked as Completed?
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Joel commented
Proton needs to implement this. It's a privacy must-have these days, and it needs to be a feature available *from the email provider*.
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atxnet commented
This is why they bought SimpleLogin.
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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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[Deleted User] commented
https://mail.tm/en/ - it would be interesting if protonmail had a public api to send and receive emails temporarily - which after a while gets deleted
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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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Joe Smith commented
Disposable generatable aliases that auto expire after a set amount of time that can be used to send and reply
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LL BB commented
This move suggests it will likely be coming:
https://protonmail.com/blog/proton-and-simplelogin-join-forces/ -
lorenzopiani commented
coming from neomailbox , I really miss their disposable emails ie:
very useful to catch whoever spams, the key is choosen during registration (one per user)
it's way better then using "+" that is easier to spot and automatically removed by bots
at the same time it'll be useful to have the opposite of a catchall address: multiple sink addresses (in a list) that are sent to dev/null that's because when you use an old domain you have some usernames infested by spam (ie info, domain@domain etc..)
if this 2 features are implemented I'll switch to protonmail the day after
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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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Billbo746 commented
I agree this would be a great privacy feature for Proton!