Why the use of domain-literals in email addresses is strongly discouraged?

[e2xbegqsdyt21hfc]

--- On Thu, 4/9/09, Shachar Shemesh wrote:

> > e2xbegqsdyt21hfc wrote:
> > 
> >   Why the use of someone@[an_explicit_ip_address] is
> > strongly discouraged?

> a. Where did you get the idea it was strongly discouraged?

Quoting RFC 822:

Note:  THE USE OF DOMAIN-LITERALS IS STRONGLY DISCOURAGED.  It
       is  permitted  only  as  a means of bypassing temporary
       system limitations, such as name tables which  are  not
       complete.

> b. Why would you WANT to use it?

I want to test an app by writing a quick/dirty wrapper that sends mail to a single, known, mail server and avoids DNS lookup.