[Dovecot] Address Extensions with System Users

[Timo Sirainen]

On Apr 18, 2009, at 2:05 AM, Bill Cole wrote:

> Scott Silva wrote, On 4/17/09 1:27 PM:
> [...]
>> AFAIR the RFC's state that all e-mail addresses are acted on in  
>> lowercase when
>> being manipulated. The upper case parts are left intact only for  
>> human beings
>> to read.
>
> That is very wrong. Email address local-parts MUST be treated as  
> case-sensitive in SMTP because historically many hosts (including  
> most systems resembling Unix) have treated usernames as case- 
> sensitive and used local-parts that map to directories on case- 
> sensitive filesystems. So RFC's 821, 822, 2821, and 5321 all  
> explicitly state that local-parts are case-sensitive and RFC's 2822  
> and 5322 say it indirectly by way of the ABNF spec. The one  
> exception is "postmaster", which gets special treatment as the only  
> address that has to exist in every domain.

I have no strong opinions about this, but http://mailman2.u.washington.edu/pipermail/imap-uw/2008-September/002190.html