Subject Author Date
Re: email module: long line problem Bernd Schoeller <bernd[dot]schoeller[at]comerge[dot]net> 23-04-2009
Just to add to Jonas comment:

2.1.1. Line Length Limits

   There are two limits that this standard places on the number of
   characters in a line. Each line of characters MUST be no more than
   998 characters, and SHOULD be no more than 78 characters, excluding
   the CRLF.

   The 998 character limit is due to limitations in many implementations
   which send, receive, or store Internet Message Format messages that
   simply cannot handle more than 998 characters on a line. Receiving
   implementations would do well to handle an arbitrarily large number
   of characters in a line for robustness sake. However, there are so
   many implementations which (in compliance with the transport
   requirements of [RFC2821]) do not accept messages containing more
   than 1000 character including the CR and LF per line, it is important
   for implementations not to create such messages.


On 4/23/09 11:35 AM, Jonas Wallden wrote:
> <sascha.n[at]> wrote:
>> When an email sent with <email>/ contains a long line (~1000+ chars),
>> at  some point spaces are inserted into the message "randomly".
> Grubba is the expert on this but it's supposedly a line length limit
> part of SMTP. We've encountered the same thing when generating HTML
> emails and since randomly inserting linebreks isn't always safe we chose
> to use base64 transfer encoding instead.
> Cheers,
> -- Jonas

Bernd Schoeller, PhD, CTO, Partner
Comerge AG, Technoparkstrasse 1, CH-8055 Zurich,