Re: Return code 250 Ok. syntax

Pascal Véron writes:

> Hello,
>
> I recently discover than we have some courier servers which don't respond  
> same return code than other courier servers.
>
> Some of them return 250 OK id=... and other return 250 Ok. (k in lower case,  
> point . and no id=)

Courier servers don't respond like that. The response to an accepted message  
is always

250 Ok. nnnn

Where "nnnn" is an internal identifier. There is no "id=" part. Wherever  
this response is coming from, it's not from Courier. Example of a Courier  
SMTP response:

MAIL FROM:<>
250 Ok.
RCPT TO:<[email protected]>
250 Ok.
DATA
354 Ok.
Subject: test

test
.
250 Ok. 0000000065455F60.00001A6A

> Problem is than a partner outside of our network need to check return code  
> to be exactly 250 OK (as RFC said it seems). So our return 250 Ok. are not  
> accepted.

Your partner is clueless. RFC 2821 states:

2.3.11 Reply

   An SMTP reply is an acknowledgment (positive or negative) sent from
   receiver to sender via the transmission channel in response to a
   command.  The general form of a reply is a numeric completion code
   (indicating failure or success) usually followed by a text string.
   The codes are for use by programs and the text is usually intended
   for human users.  Recent work [34] has specified further structuring
   of the reply strings, including the use of supplemental and more
   specific completion codes.

https://datatracker.ietf.org/doc/html/rfc2821#section-2.3.11

The numeric completion code is the only logical part of the response. The  
text that follows can be anything, and does not mean anything (the blurb  
about extended reply strings is immaterial).

I repeat: your "partner" is a clueless idiot. RFC 2821 itself gives a  
completely different freeform text for a 250 response:

https://datatracker.ietf.org/doc/html/rfc2821#section-2.3.11

250 Requested mail action okay, completed

That's an example of a 250 response from RFC 2821. The text is completely  
meaningless, to mail servers. The only look at the numeric code.

> So question are : what is the correct return code in courier ? 250 OK or 250  
> Ok. ?

Both of them are correct, even the one that's not coming from Courier.

> And is it possible and how to change to respond with syntax 250 OK  ?

No, there is no such setting in Courier. Tell your partner to fire whoever  
told you that nonsense, for incompetence, and they need to hire someone who  
actually understands SMTP.

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