This is the only reason I'm not using the iOS app the moment. All my send form addresses are alias for websites I own but where I use gmail to manage email. It's not an iOS limitation as other email apps (Spark, Newton mail etc) do it just fine. Hopefully this get released in the next update

Yes, using iOS I really want to have different default sender and reply-to email addresses, depending on which gmail account I received the email from. I use two gmail accounts. For one of them, when I reply I want it to clearly come from the same gmail account. For the other, when I reply I want to use the alias that I use for most email. On a Mac this is how airmail already works.

I saw this feature request marked as accepted, and I also saw someone wrote that it is an OS limitation. Could you make that clearer? Is this something in the queue of things to be worked on, or not?

I would love this. I've got a Gmail account that doesn't have any aliases but I always use my iCloud account with an alias (and never the regular login email). I would love the ability to always send email with that alias JUST for that particular account (and not an app-wide setting). I'm putting in my vote for account-specific default aliases.

actually is an OS limit

I would be even happier if we had an option that would allow us force all replies (to emails received through an account) to default to our chosen alias!

I agree, it would great. In my case, per every gmail account I have connected, id prefer to have an alias email set as the default sending email for the account in which its nested under instead of my @gmail address.