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  • Smart host wants authinfo that matches From: address

    From Melvin Kowsnofski@21:1/5 to All on Tue Jan 3 18:44:27 2023
    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?

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  • From Claus =?iso-8859-1?Q?A=DFmann?= @21:1/5 to Melvin Kowsnofski on Wed Jan 4 01:22:42 2023
    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.

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  • From Melvin Kowsnofski@21:1/5 to All on Wed Jan 4 07:24:43 2023
    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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