Bernd Wurst writes:

Hi.

I recently set up a telephone system from german manufacturer AGFEO.
This one has the capability to send e-mails when a new call is received
on the voicebox.

As I also operate a server with courier mta, I just created an account
and set it up in the phone system.

But mail does not work. In the server log files, I find this one:
courieresmtpd: error,relay=[...],msg="535 Authentication required.",cmd:
NOOP

Am I right that this is because I require authentication (on port 587)
and this client does send a NOOP before auth and courier does not accept
NOOP unauthenticated.

As I really do not understand why this NOOP is sent here, I also do not
understand why courier rejects NOOP. NOOP is defined in RFC 5321 as follows:
   This command does not affect any parameters or previously entered
   commands.  It specifies no action other than that the receiver send a
   "250 OK" reply.

So does courier really kick off the client because of that NOOP?

It doesn't disconnect the client, it just rejects the command.

But I agree that this doesn't make a lot of sense, so this will be changed.

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