Send from any address of custom domains if catch-all in enabled
It is now possible to send an e-mail using any alias account+alias@customdomain.tld
It doesn't seem possible at the moment to send from anything@customdomain.tld unless an address was created for it, regardless of catch-all.
I wish that if I can receive to any address using a catch-all, to reply from any of those addresses.

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blend commented
I use unique email addresses at my custom domain every time I have to give out my address so I can tell, if my data is breached, where the source of the breach was. Right now, to reply, I have to add an address to my account, send the email, then delete the address again. It's not unmanageable but I might end up moving to another provider when my renewal comes up in November, as plenty of them offer this feature.
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Florian commented
There are dublicate to this request. If they could be bundled, this feature would move up in the wanted features list :-)
https://protonmail.uservoice.com/forums/284483-proton-mail/suggestions/41522041-reply-from-catch-all-address
https://protonmail.uservoice.com/forums/284483-proton-mail/suggestions/45429793-allow-custom-domain-name-with-catchall-to-also-sen -
Pomper commented
People may want to combine their votes
Duplicate or similar to: https://protonmail.uservoice.com/forums/284483-proton-mail/suggestions/45429793-allow-custom-domain-name-with-catchall-to-also-sen
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Mike commented
Mailbox.org allows this from all custom domains.
It solves a very popular use case that has driven the email forwarding market with SimpleLogin and AnonAddy quite a bit.
I would think a toggle option on each domain to handle catch-all as aliases rather than routing to a catch-all address would be a good way to implement it.