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Actually, this is of very little use, even if you get it to work. Webmail authenticates as ITSELF, not as the user sending the mail. The mails come from the store box, too.
It appears that you do not have the webmail smtphost set to a smtp server that allows authentication. That's what is causing the error.
I know about the little use of the webmail authentication but it is something I need to do because in my configuration I have to differentiate between users who can send emails to internet and users who can not, and in order to do that, I need to authenticate all the users. So far is working if the user uses an email client.
For webmail I did not know that I have to add in the tcp_intranet channel definition the attribute: mustsaslserver.
One more time. . .
What you are asking Webmail to do just is not possible. Webmail does not authenticate as the user sending the mail. If forced to use authentication, it authenticates as the "webmail user" that was defined on installation.
You cannot separate webmail users out by authenticated address. Sorry.