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From: John Levine <johnl@taugh.com>
Newsgroups: comp.mail.sendmail
Subject: Re: Fastest way to inject a lot of mail?
Date: Sat, 9 Mar 2024 00:25:28 -0000 (UTC)
Organization: Taughannock Networks
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According to Claus Aßmann  <INVALID_NO_CC_REMOVE_IF_YOU_DO_NOT_POST_ml+sendmail(-no-copies-please)@esmtp.org>:
>John Levine  wrote:
>
>>  Is there a faster way to do it? SMTP to 127.0.0.1? LMTP?
>
>First you need to identify the bottleneck(s),
>then you can work on solutions.

Well, yeah, that's why I was wondering whether running the sendmail program
is likely to be slow.

>BTW: did you read the fine documentation?
>(hint: "TUNING"...)

I did and unless I missed something, it says nothing about injecting
mail via the sendmail command other than the obvious thing that you
want to queue rather than delivering synchronously.

So here's a question: I have on the order of 10,000 messages, each
with a dozen or so recipients. It's currently running the sendmail
command for each one. If I opened a connection to 127.0.0.1 and
did a sequence of MAIL FROM/RCPT TO/DATA, would that be faster? How
about if I did it with N processes in parallel for some modest N? It
currently takes about 6 hours on a moderately fast VPS.

If nobody has any idea, OK, but it's hard to believe I'm the first person
ever to wonder about this.

-- 
Regards,
John Levine, johnl@taugh.com, Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail. https://jl.ly