On 01/16/2015 05:23 AM, P.V.Anthony wrote:
> Hi,
>
> I hope I am using the correct terms here.
>
> Current problem.
> Some users accounts has been compromised (I assume) and sending spam.
> The quota feature has been very helpful in limiting the outgoing
> emails to 50 emails an hour. Checked the mail queue and noticed many
> emails have the "From" not from the users domain.
>
> Is there a way to prevent sending out emails which are not the same as
> the login username? Currently all login username are the full email
> address.
>
> Possible solution.
> If policyd checks the "From" and/or "Envelope" against the username
> and if it does not match, reject the email going into the queue.
>
> Or is there an easier way?
>
> If I am using the wrong terms, need the correct terms so that I can do
> more searching in Google.

http://www.postfix.org/SASL_README.html
"Envelope sender address authorization"

-N

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