Allow custom domain name with catchall to also send email with any username
Now my custom domain has a catch-all for incoming mail, I would like that also to work for outgoing mail. So that I can 'Customise From Address' to allow any username in custom domain and I don't have to set up each username individually. Replies will just come back to catch-all.
Eric Johnson commented
It's best to leave the catchall turned off. With catchall turned on, if someone sends an e-mail to a non-existent address, it looks to them like it went through to the intended recipient. Leave it turned off so the sender gets back a response telling them that they made a mistake with the address.
Walter White commented
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Second this, ability to be able to send from any catchall from custom domain or ability to add unlimited amount of custom domain usernames seems vital.