Tuning some defaults for 2.5: lmtp_downcase_rcpt

Jeroen van Meeuwen (Kolab Systems) vanmeeuwen at kolabsys.com
Thu Feb 10 10:22:30 EST 2011

Hi there,

In our IRC channel, it was suggested to look at RFC 2821, section 2.4, quoted 
as saying:

 "However, exploiting the case sensitivity of mailbox local-parts impedes 
interoperability and is discouraged."

The problem statement is as follows: The recipient is USER at DOMAIN.DE, and 
while the mailbox name is "user at domain.de", or even "user", the mail bounced.

Not completely aware of the full implications and/or codebase, I wanted to put 
the topic on switching the default to be relaxed in the case of case 
sensitivity out there for discussion.

Long story short; the proposal is to ship with a default lmtp_downcase_rcpt of 

Kind regards,

Jeroen van Meeuwen

Senior Engineer, Kolab Systems AG

e: vanmeeuwen at kolabsys.com
t: +316 42 801 403
w: http://www.kolabsys.com

pgp: 9342 BF08
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