Email case problem

Andrzej Adam Filip anfi at
Wed Jun 8 17:29:58 EDT 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.

<quote src="man imapd.conf">
lmtp_downcase_rcpt: 0
If enabled, lmtpd will convert the recipient address to lowercase (up to 
a ’+’ character, if present)
username_tolower: 1
Convert  usernames  to  all  lowercase before login/authenticate. This 
is useful with authentication  backends  which  ignore  case during 
username lookups (such as LDAP)

Andrzej [en:Andrew] Adam Filip anfi at anfi at
"All that is necessary for the triumph of evil is that good men do
  nothing"   -- Edmund Burke (18th century)
Cyrus Home Page:
Cyrus Wiki/FAQ:
List Archives/Info:

More information about the Info-cyrus mailing list