How can I send emails with any alias as sender?

Help with Setup/Upgrade
1

Hello,

first:
Mail-In-A-Box runs great on a VPS.
Many thanks to the makers of this wonderful software!

I have successfully managed to set up a catch-all alias that forwards all mails to any email address of my domain to my mailbox.

Now I want to be able to send via my mailbox also from any email address of my domain.

Example:
My mailbox is user1@example.com
I receive via catch-all a mail on alias1@example.com in my mailbox.
I want to reply to this mail as alias1@example.com by entering alias1@example.com in the “FROM” field.
However, the recipient then receives an email from user1@example.com.

How can I send as user1@example.com or any other alias without having to manually create a separate identity for each alias?

2

You can’t. Setting an identity in the email client is what controls this. Additionally, MiaB requires you to create an alias with a permitted sender (or email user) to be able to send as that user.

3

I have now created an alias and set myself as the permitted sender.
I have also created an additional identity via Roundcube.

Then I tried sending via Outlook 2019 (connected via ActiveSync), entered the created alias in the “From” field and sent a test email.
However, the address of my mailbox was again used as the sender instead of the alias.

Was my procedure correct?
Is sending as an alias only possible under Roundcube?
What would be the correct procedure?

4

I do not know as I refuse to use M$ products.

5

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