[enum-wg] ENUM-capable email client?

Florian Weimer wrote:
> * Carsten Schiefner:
> 
> 
>>My question is: is anyone aware of a similar extension or even built-in 
>>function of a mail client, so that an E.164 number would be resolved to 
>>an email address?
> 
> 
> Shouldn't this be part of the MTA, and not the MUA?  After all, it's
> some kind of mail routing.

IMO the ENUM lookup should be done in the client before sending the 
Email to the MTA. Because if there is no email address asscoiated with 
the E.164 phone number, the client can show the problem to the user 
immediately, wheras the the MTA would have to generate an error message.

regards
klaus