On Mon, Jan 24, 2022 at 10:29:15PM +0100, Jaroslaw Rafa <r...@rafa.eu.org> 
wrote:

> Dnia 24.01.2022 o godz. 15:51:33 Ruben Safir pisze:
> > 
> > So what is the smtpd on the above line?  Am I telling port 25 to obey
> > the rules for port 587?
> 
> Did you notice the comments at the top of default master.cf file? They
> explain the syntax:
> 
> > # service type  private unpriv  chroot  wakeup  maxproc command + args
> 
> If you compare this to the line in question:
> 
> > smtp      inet  n       -       n       -       -       smtpd
> 
> "service" is "smtp"
> "type" is "inet"
> "private" is "n"
> "unpriv" is "-" ("-" means use default value)
> "chroot" is "n"
> "wakeup" is "-" (default)
> "maxproc" is "-" (default)
> "command + args" is "smtpd"
> 
> So answer to your question is: "smtpd" is the name of the executable that is
> run to provide this service. Both services, on port 25 and 587, are provided
> by two instances of the same executable, therefore "smtp" in both cases.

You meant: therefore "smtpd" in both cases.

> After "smtpd" there can be arguments used to call this executable - these
> arguments are used to make both services operate differently.
> -- 
> Regards,
>    Jaroslaw Rafa
>    r...@rafa.eu.org
> --
> "In a million years, when kids go to school, they're gonna know: once there
> was a Hushpuppy, and she lived with her daddy in the Bathtub."

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