Re: [Fetchmail-users] Weird Return-Path processing

[Skle.pik <sp...@ma...>]

On 27/03/2020 07:41, Skle.pik wrote:
> Hi,  I've been using fetchmail for quite a while without any complain whatsoever, but recently I found some of the messages not to be delivered.  The investigation of processing for not delivered mails shows Return-Path to be split to 2 lines:  Return-Path: <noreply=  abba.com__al4bl7qh36xreia2@35p  11.bnc.salesforce.com>  Delivered-To:   Unfortunately this makes mailer choking:  SMTP> MAIL FROM:<noreply=  abba.com__al4bl7qh36xreia2@35p  11.bnc.salesforce.com> SIZE=4070  SMTP< 553 5.0.0 ....   Does anyone know who is to blame - is this Return-Path formatting violation on POP side, or maybe it is mailer being intolerant ?   Cheers
Sorry for broken formatting, seems like my web MUA can't do plaintext.

Here is plaintext version of a message with some updates:

Hi,
I've been using fetchmail for quite a while without any complain 
whatsoever, but recently I found some of the messages not to be 
delivered.  The investigation of processing for not delivered mails 
shows Return-Path to be split to 2 lines:
Return-Path: 
<noreply=abba.com__al4bl7qh36xreia2@35p9h14cih4s.6f-1gv0suag.ap
11.bnc.salesforce.com>
Delivered-To:

Unfortunately this makes mailer choking:
SMTP> MAIL 
FROM:<noreply=abba.com__al4bl7qh36xreia2@35p9h14cih4s.6f-1gv0suag.ap
11.bnc.salesforce.com> SIZE=4070
SMTP< 553 5.0.0 ....

I did check POP3 side with Python poplib and clearly the Return-Path is 
split across lines - result below:

(b'+OK',
[b'Return-Path: 
<noreply=abba.com__al4bl7qh36xreia2@35p9h14cih4s.6f-1gv0suag.ap',
b' 11.bnc.salesforce.com>',
b'Delivered-To:

Does anyone know who is to blame - is this Return-Path formatting 
violation on POP side, or maybe it is mailer being intolerant ?

Cheers