MIAB on iPhone Mail App Using Alias

I am able to get incoming mail from an Alias on the iPhone Mail app from my MIAB server; however, send outgoing messages gets the error “Cannot Send Mail The server rejected on of the recipients addresses. The message has been placed in your Outbox”. If I do not send from the alias and use the main account it works fine. Please advise. Thank you!

Try sending as the alias in Roundcube. If that works, check through the configuration settings of the app.

Be certain that the alias is listed as a permitted sender on the MiaB side, and that you have configured the identity correctly on your email client.

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