Tuning some defaults for 2.5: lmtp_downcase_rcpt

Andrew Morgan morgan at orst.edu
Mon Feb 14 17:09:38 EST 2011

On Fri, 11 Feb 2011, Jeroen van Meeuwen (Kolab Systems) wrote:

> Hi there,
> (This is a re-posted message from our development mailing list.)
> 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
> 1.

We use lmtp_downcase_rcpt=1 without any problems here.  However, our email 
addresses only contain US-ASCII characters.


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