Message contains invalid header

[Adam Stephens]

Marten Lehmann wrote:
> Hello,
>
> from time to time we are getting this message in our exim logs:
>
> LMTP error after end of data: 554 5.6.0 Message contains invalid header
>
> I have also experienced this error while I'm syncing emails from an 
> old server to our new cyrus mailserver. I have
>
> munge8bit: false
>
> in my imapd.conf and reject8bit is set to "false" by default. Which 
> headers is cyrus complaining about? I cannot change this world where 
> clients like Notus Notes are sending invalid emails, but simply 
> refusing these mails is a bad choice. And we also have a lot of emails 
> we received in the old setup and I wouldn't know how to explain to our 
> users, that they cannot access these messages any more.
>
> How can I make cyrus less strict?
>
If it's mails from the broken Lotus Notes client that's the problem (and 
they're the only ones we saw here), it's caused by a null Message-ID 
header; just have your SMTP server remove those. LMTP will generate a 
new, valid message-id when the message is delivered.

in Exim:
headers_remove = ${if match{$h_Message-ID:}{\N^\s*$\N} {Message-ID} {} }

cheers,
Adam.

-- 
--------------------------------
Adam Stephens
Network Specialist - Email & DNS
adam.stephens at bristol.ac.uk