Path: ...!feeds.phibee-telecom.net!news.mixmin.net!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: none <hzcnjkx656@tormails.com>
Newsgroups: comp.mail.sendmail
Subject: Re: sender rewrining advice
Date: Sat, 23 Mar 2024 11:00:28 +0100
Organization: A noiseless patient Spider
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>> At some point in the future I would like to secure host b more, so 
>> authenticated users can only send out email with their assigned address.
> 
> I'm aware that such is done by some MTAs.  I've wondered about doing 
> that with Sendmail.  But then I realized that users were authenticating, 
> thus I would have a good idea (but no guarantee) who, or at least which 
> account, was being used to abuse things.  I've not needed to actually go 
> down this path (yet).

I think this is a selling point of services like sendgrid and the likes. 
There are even banks using such services. So I assume they check this, 
otherwise it would be very easy for scammers to send out phishing emails.

Since I am thinking of developing/adding a business to consumer service, 
I am getting a little more interested in this.