Working with External Aliases

I work with another open source project and they gave me an alias to use with their organization. I can successfully receive email from the alias to my local email.

However I would like to send email as the alias. If I just sent it up in my mail client, when I try to send email, I get:

The reported error was “RCPT TO <alias> failed: <mymail>: Sender address rejected: not owned by user <mymail>”.

Workaround: I create a local alias in MIAB admin for the alias to my email. Great! I can now send email as the alias.

Except if I want to email someone else at the project. Then I get:

Recipient address rejected: User unknown in virtual mailbox table

Which I assume means that the mail server in my MIAM installation is trying to find a local account for them and it fails

So what is a better workaround? I don’t mind editing config files but I really don’t know much about mail servers so I don’t know where to begin.

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I removed “reject_authenticated_sender_login_mismatch” from smtpd_sender_restrictions in /etc/postfix/
I had to send mail from my google and my work address and this worked for me

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