From: Aaron Rogge (aaronunionaires.org)
Date: Mon Apr 26 2004 - 13:36:06 CDT

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Thank you,
aaron

On Sun, 25 Apr 2004 13:47:01 -0400 (EDT), Wietse Venema
<wietseporcupine.org> wrote:

> Aaron Rogge:
>> I am wanting to prevent emails being sent that appear to come from my
>> domain(s) but are invalid addresses. I am willing to accept emails that
>> appear to be sent from a valid user.
>
> This is built into Postfix 2.1, but it's still turned off by default.
> To enable, specify "smtpd_reject_unlisted_sender = yes".
>
> With Postfix 2.0 and earlier you'd have to duplicate all the accounts
> into a sender access table, which is not very practical.
>
> I added sender validation in Postfix 2.1, just like recipient
> validation in 1.0, in order to keep obvious junk out of the mail
> queue. Some day some spammer will discover they can do dictionary
> attack spam with a bogus local sender address and avoid drawing
> the attention of third parties via backscatter mail.
>
> Recipient validation has been on by default since 1.1, and I hope
> that sender validation can be turned on by default in Postfix 2.2.
>
> Wietse
>>
>> Configuration:
>>
>> multiple virtual domains
>> authenticate senders using pop-before-smtp, I know I should use SASL but
>> haven't gotten around to configuring it and this is easier for my users.
>

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