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.
This is CRITICAL.
I have a custom domain specifically so I can give each merchant I'm dealing with a unique address. For example let's say I was doing business with McDonalds, I'd give them the email address mcdonalds@[mydomain].com, then the catch-all for [mydomain] would receive it. But now if I want to send an email in reply, it will come from info@[mydomain].com. I need to be able to set the "from" field manually so that it instead looks like the email was sent from mcdonalds@[mydomain].com.
I do not want to have to set up a separate address for every single merchant - that's totally unworkable.
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.
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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.