Thank you so much for the reply, and thanks so much for Postfix, which I’ve 
used for many years. 

If I continue using QMQP I’ll gather more definitive proof; but it sounds like 
(a) I have a bug in my QMQP protocol handler (likely); and/or (b) I’m using 
QMQP in a way it wasn’t designed (certainly). 

Thanks again for the prompt reply and the wonderful software you’ve built. 

Brad

On March 21, 2024 at 6:56:45 AM, Wietse Venema via Postfix-users 
(postfix-users@postfix.org) wrote:

Brad Koehn via Postfix-users:  
> I'm trying to deliver email with Postfix 3.7.10 using `qmqpd`.  
> Unfortunately when I do this, the email is often unreadable by a  
> variety of email clients.  

I suppose you mean "receive" mail with Postfix using qmqpd.  

> Curiously, if I deliver the same email directly to Dovecot via  
> LMTP, clients have no issue with the message. I expected the  
> opposite to be the case: by bypassing all the cleanup functionality  
> my emails would be harder to read.  
>  
> I'm early in my investigation, but I was wondering what might be  
> going wrong? I notice for starters that the version I deliver via  
> QMQP has the `Content-Length` header removed; th LMTP version  
> preserves it.  

This is configurable with message_drop_headers (default: bcc,  
content-length, resent-bcc, return-path). But I think you have worse  
problems.  

> In another case, the QMQP version has an extra CRLF before the  
> "This is a multi-part message in MIME format" text, which I believe  
> makes it unrenderable; the LMTP version doesn;t have that extra  
> line  

Your message is malformed: there was no empty line after the last  
header line. When email is out-of-spec, it may not be delivered  
in it malformed state.  

Wietse  
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