Am 19.06.19 um 12:53 schrieb Viktor Dukhovni:
>> On Jun 19, 2019, at 6:37 AM, Ralf Hildebrandt <r...@sys4.de> wrote:
>>
>> The error message says:
>>
>> Protocol error: host gmail-smtp-in.l.google.COM[173.194.76.26] said: 250 
>> 2.1.5 OK w9si551343wmd.47 - gsmtp (in reply to DATA command)
> 
> Ralf, your inattention to detail disappoints me. :-(
> 
> The correct reply to "DATA" is "354" not "250".  Something is awfully
> out of sync if Gmail is returning "250" in response to "DATA".

to me this looks more as a 250 OK response _after_ data is sent because a 
typical queue ID is part of the response string.
I cannot see such errors at a "fast grep" here.

Wild guess: smtp-server (or your client) is abnormal and you hit exactly such 
an instance.
-> could you correlate the error with an IP?
-> could you enable debug_peer_list for one/some/all? servers generating this 
error?

and: which postfix version do you run?
( @mail-cvk <-> python.org )

Andreas 

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