Entry

My client keeps on getting "451 See http://pobox.com/~djb/docs/smtplf.html" when I try to send email!!

My client keeps on getting "451 See http://pobox.com/~djb/docs/smtplf.html" when I try to send email!!

Dec 27th, 2001 19:59
Brian Coogan,

With some email clients you'll get complaints from qmail about the 
presence of bare LFs in email, with qmail refusing to send the email 
citing the following URL: 
      451 See http://pobox.com/~djb/docs/smtplf.html 
which redirects to: http://cr.yp.to/docs/smtplf.html 
What is confusing is that these email clients will have worked just 
fine with sendmail and many other MTAs.
What is happening here is that your email client is violating internet 
email standards and using LF inappropriately - see the URL above for 
more info.  Unfortunately qmail enforces these standards whereas most 
MTAs just ignore them, thus serving to perpetuate the problem further.
If you want your non-LF-compliant email client to be able to send email 
anyway you can do so through ofmipd, part of the mess822 djb package 
which interfaces to qmail and cleans up messages.  We have it listening 
on a different IP on our mail servers for this reason, although we only 
have a few non-LF-compliant client.  Installing it is pretty trivial.
For info on ofmipd, see the mess822 package:
   http://cr.yp.to/mess822.html
There are some other solutions around but this appears the neatest for 
a qmail site.
This info seems very hard to find elsewhere!!