We are not discussing about MTA nor MDA. We are talking about services

Kalpin

Sent from my Nokia phone -----Original Message----- From: James Hess Sent: 01/01/2010 12:20:46 PM To: Jason Slagle Cc: dalnet-services@lists.dal.net Subject: Re: [DALnet-services] dalnet-services@ observations

On Thu, Dec 31, 2009 at 5:23 PM, Jason Slagle raistlin@tacorp.net wrote:

On Wed, 30 Dec 2009, Jason Hill wrote:

[snip]

Apparently the only ISP's and email providers you use run windows :P Pretty much every unix MTA I've come across uses case sensitive usernames. Well the LDA does anyways.

You mean case-Insensitive, right? In current versions of Sendmail, Sendmail 8: sending e-mail to "BlaHBlaH" will reach the same destination as sending to blahblah.

The E-MAIL ADDRESS is case-insensitive with respect to delivery. The LOCAL USERNAME must is case-sensitive, and must be all lowercase.

Of course the case of characters in e-mail message headers are preserved, but they have nothing to do with delivery. Only the envelope recipient is important, and that's case-insensitive.

That is: no matter what case of characters you type in the e-mail address that you SEND to the MTA, sendmail always converts it to lowercase. The e-mail goes to the username that is the same as the e-mail address, but all lowercase.

This is true, unless you are one of those very unusual sites that do something like MODIFY_MAILER_FLAGS(`LOCAL', `+u')dnl

*(In fact, if you create a unix user with an uppercase character in their username, they won't be able to receive mail at all until/unless you create an /etc/aliases entry to map username: User)

Postfix and a few others do pretty much the same thing, differing in some fine details (but the SMTP rcpt to: is case-insensitive nonetheless)...

Jason

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