Email case problem

Andrew Morgan morgan at
Wed Jun 8 17:28:26 EDT 2005

On Wed, 8 Jun 2005, Sun Advocate Webmaster wrote:

> I have a slight problem, and was curious what can be done to fix it.
> I have a Cyrus/Postfix setup. It works great; however, we often receive 
> emails that don't match the case of the accounts on cyrus (all of them are 
> strictly lower case). In that event, postfix receives them OK, but cyrus 
> rejects them during LMTP negotiation.
> Many of our clients are sending stuff using addresses that are using all caps 
> or title caps. These emails are being rejected by our system.
> I totally understand that Cyrus and Postfix, for that matter, try hard to 
> adhere to standards (RFC, for example). However, business is business... and 
> we have to cater to our customers. Many of these customers are on Windows 
> systems, and don't have control (or knowledge, for that matter) of their mail 
> systems anyway.
> Is there a workaround? Is there a setting for Cyrus that tells it to ignore 
> case? I'm also going to post to the postfix list also.
> Any help would be most appreciated.

>From my /etc/imapd.conf file:

# Forcing recipient user to lowercase
# Cyrus 2.1 is case-sensitive.  If all your mail users are in lowercase, it is
# probably a very good idea to set lmtp_downcase_rcpt to true.  The default is
# to assume the user knows what he is doing, and not downcase anything.
lmtp_downcase_rcpt: yes

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