Re: [Fetchmail-users] Warning users about authentication failures

[Matthias A. <mat...@gm...>]

Am 31.08.26 um 10:42 schrieb Andrea Venturoli:
> On 9/17/25 09:18, Andrea Venturoli wrote:
>> On 6/23/25 18:53, Matthias Andree via Fetchmail-users wrote:
>>
>>> I would probably start by checking what actual error code is passed 
>>> through this code in driver.c (near line 1150) as return from the - 
>>>  >getauth(...) method:
>>
>> Hello.
>>
>> I think I found the reason.
>> In the logs I see:
>>
>>> sm-mta[13685]: 589NKPid013685: collect: relay=[127.0.2.1], 
>>> from=<FET...@ma...>, info=Bare linefeed (LF) 
>>> not allowed, where=body, status=tempfail
>>> sm-mta[13685]: 589NKPid013685: from=<FETCHMAIL- 
>>> DA...@ma...>, size=337, class=0, nrcpts=1, 
>>> proto=ESMTP, daemon=MTA, relay=[127.0.2.1]
>>
>>
>>
>> I'll try and change the code to use CRLF instead...
> Hello.
> Sorry for taking so long.
> I fixed this with the two attached patches. 


Hello Andrea,

thanks a lot for the debugging and the patch proposal.

You wouldn't need to patch the "report(...)" lines reporting to stderr, 
but you seem to have a found a long-standing bug that we don't send CR 
on strict SMTP/LMTP listeners... whereas a native MDA (maildrop, 
deliver, or similar) or something called via Unix-domain socket might 
not want CRs but bare LF.  We do have a forcecr option in fetchmail, but 
I think I need to auto-enable it for sending warnings out via SMTP...  
and therefore I won't take the patches as they are.

Filed my reminder at 
https://gitlab.com/fetchmail/fetchmail/-/work_items/97 - I need to fix 
this another day.

Thanks again.

Regards,
Matthias