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computers / comp.mail.sendmail / Re: Smart host wants authinfo that matches From: address

SubjectAuthor
* Smart host wants authinfo that matches From: addressMelvin Kowsnofski
`* Re: Smart host wants authinfo that matches From: addressClaus Aßmann
 `- Re: Smart host wants authinfo that matches From: addressMelvin Kowsnofski

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Subject: Smart host wants authinfo that matches From: address
From: kowsnof...@comcast.net (Melvin Kowsnofski)
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 by: Melvin Kowsnofski - Wed, 4 Jan 2023 02:44 UTC

Comcast's recent security updates now insist that SMTP submissions to the smart host be authorized by an ID and password that matches the From: address. I send mail from my system from several valid Comcast IDs. How can I get sendmail to authorize with the correct ID? Somehow I doubt that I can just have several different AuthInfo lines in the authinfo file, or would that actually work?

Re: Smart host wants authinfo that matches From: address

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From: INVALID_...@esmtp.org (Claus Aßmann)
Newsgroups: comp.mail.sendmail
Subject: Re: Smart host wants authinfo that matches From: address
Date: Wed, 4 Jan 2023 01:22:42 -0500 (EST)
Organization: MGT Consulting
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Originator: ca@x2.esmtp.org (Claus Assmann)
 by: Claus Aßmann - Wed, 4 Jan 2023 06:22 UTC

Melvin Kowsnofski wrote:
> Comcast's recent security updates now insist that SMTP submissions to the
> smart host be authorized by an ID and password that matches the From:
> address. I send mail from my system from several valid Comcast IDs. How can
> I get sendmail to authorize with the correct ID? Somehow I doubt that I can

AUTH is per session, From: is per transaction (TA) -- as there can
be multiple TAs per session, you would first have to prevent that.
5.4. M -- Define Mailer
maxmessages The maximum message deliveries per connection

Then you would have to find out whether the value for From (Envelope:
$f if it matches the header From:) is actually available when
authinfo if called. If that's the case, then you could select the
proper info.

Overall: it's probably simpler to let your MUA contact the Comcast
server directly.

--
Note: please read the netiquette before posting. I will almost never
reply to top-postings which include a full copy of the previous
article(s) at the end because it's annoying, shows that the poster
is too lazy to trim his article, and it's wasting the time of all readers.

Re: Smart host wants authinfo that matches From: address

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Subject: Re: Smart host wants authinfo that matches From: address
From: kowsnof...@comcast.net (Melvin Kowsnofski)
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 by: Melvin Kowsnofski - Wed, 4 Jan 2023 15:24 UTC

On Wednesday, January 4, 2023 at 12:22:44 AM UTC-6, Claus Aßmann wrote:

> AUTH is per session, From: is per transaction (TA) -- as there can
> be multiple TAs per session, you would first have to prevent that.
> 5.4. M -- Define Mailer
> maxmessages The maximum message deliveries per connection
> ...
> Overall: it's probably simpler to let your MUA contact the Comcast
> server directly.

That's the same conclusion I reached. Problem is that I'm reading all those Comcast IDs in a common account in a single MUA instance (Thunderbird), and I'd have to manually select the right SMTP server setup for each outgoing message. I'd need to write a filter that accepts messages and directs them to the appropriate SMTP server. Wait a minute, ... that sounds like I'm re-inventing sendmail.

I'll work out something, but I've got too many irons in the fire right now. Thanks for confirming my conclusion.

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