Re: How do I check if the format of an email address is valid?

[Lennart Borgman <lennart.borgman.073@student.lu.se>]

Reiner Steib wrote:
> On Thu, Mar 30 2006, Lennart Borgman wrote:
>
>   
>> How do I do this in Elisp?
>>     
>
> How do you define a "valid email address"?
>
> (a) Valid according to RFC2822?
>
> (b) Valid in the sense of the given domain exists, can receive mail
>     and the localpart corresponds do a mailbox?
>
> (c) Something different?
>
> For (a), the variables `gnus-button-mid-or-mail-regexp',
> `gnus-button-valid-localpart-regexp' and
> `gnus-button-valid-fqdn-regexp' in `gnus-art.el' contain some related
> checks.
>
> Bye, Reiner.
>   
Thanks Reiner! Two small worries:

- `message-valid-fqdn-regexp' (which is copied to 
`gnus-button-valid-local-part-regexp') has a list of TLD:s. Is this 
really wise? I guess there will be new TLD:s. (In fact there may already 
be some that are not in this list.)

- It is maybe a pitty that you have to load those big modules (message 
and gnus) just to get the patterns.

And then I can not stop myself from wondering if there really are any 
format of email addresses that asures that conforming addresses are 
actually existing email adresses ;-)