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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Grant Taylor‏ @DrScriptt 18 Apr 2019
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      Oh my. I've entered into a community that's running email servers for a specific purpose and it seems as if some of them don't know how / why email works. This tweet brought to you by some of them saying you needed to allow relaying for email to local recipients.

      2 replies 0 retweets 5 likes
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    2. Grant Taylor‏ @DrScriptt 18 Apr 2019
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      One of them was also checking to see if the Secure Submission (a.k.a. "submissions") was available on TCP port 465, by connecting and looking for the "250 " string. S/he wasn't seeing it on any system. I'm guessing because they weren't starting a TLS connection.

      1 reply 0 retweets 1 like
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    3. Grant Taylor‏ @DrScriptt 18 Apr 2019
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      Also, the greeting banner will respond with "220 " and only give the "250 " after the client HELO's or EHLO's.

      1 reply 0 retweets 1 like
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    4. Grant Taylor‏ @DrScriptt 18 Apr 2019
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      They didn't sort a list of mail servers based on MX priority.

      1 reply 0 retweets 1 like
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    5. Grant Taylor‏ @DrScriptt 18 Apr 2019
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      One of them also didn't know the difference between a delay notification and a bounce.

      1 reply 0 retweets 1 like
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    6. Grant Taylor‏ @DrScriptt 21 Apr 2019
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      Today's example: Running Postfix locally (and complaining about it) to provide the /usr/sbin/sendmail command instead of configuring the client to use an SMTP server. All of which passes through ToR.

      1 reply 0 retweets 0 likes
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    7. Hector Martin‏ @marcan42 28 Apr 2019
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      Replying to @DrScriptt

      I do that pretty commonly. It's easier and more flexible to run a local postfix with a really dumb smarthost-style config, then basically ~all software that wants to send email magically works and you get queuing and other goodies.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 28 Apr 2019
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      Replying to @marcan42 @DrScriptt

      It's part of my standard non-email server setup, often with a config to rewrite anything@<service domain or hostname> to postmaster, so that daemon-generated emails all get funneled to a known destination.

      12:30 AM - 28 Apr 2019
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Grant Taylor‏ @DrScriptt 28 Apr 2019
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          Replying to @marcan42

          I’m confident that you have a better grasp on what you are doing and why you are doing it than some in the group I’m talking about.

          1 reply 0 retweets 1 like
        3. Grant Taylor‏ @DrScriptt 28 Apr 2019
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          Replying to @DrScriptt @marcan42

          They wanted one application to send email. So they installed Postfix and configured it to smart host instead of using a different client config to use SMTP to the smart host directly.

          1 reply 0 retweets 1 like
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