Case sensitive usernames and sendmail - mystic voodoo

[Erich Dollansky]

Hi,

On Sun, 26 May 2013 18:44:41 -0600
Modulok <modulok at gmail.com> wrote:

> List,
> 
> Step1: Make a new user::
> 
>     root at localhost# pw useradd foo -m -s /bin/tcsh -h 0
>     password for user foo: (secret)
> 
> Step 2: Does sendmail know them::
> 
>     root at modunix# sendmail -bv foo at localhost
>     foo at localhost... deliverable: mailer local, user foo
> 
>     # Good...
> 
> Step 3: Make a new user with uppercase 'B'::
> 
>     root at localhost# pw useradd Bar -m -s /bin/tcsh -h 0
>     password for user Bar: (secret)
> 
> Step 4: Does sendmail know them::
> 
>     root at modunix# sendmail -bv Bar at localhost
>     Bar at localhost... User unknown
> 
> 
> Curious, why? I know usernames are case-sensitive, I thought emails
> were too. Without fighting an epic battle with with the sendmail
> configs, is there a simple way to make this work?
> 
> The obvious answer is probably, "usernames should be lowercase!" and
> for new users I'll enforce that policy. For existing users however,
> who may already have lots of case-sensitive usernames in various
> config files, etc this isn't a real option. By just altering their
> usernames I'm afraid I'd break the whole damn universe. How can I
> enable mail for them?
> 
have you read this?

http://www.linuxquestions.org/questions/linux-software-2/sendmail-unable-to-find-users-22290/

Erich