Re: Programmers with network engineering skills

[Owen DeLong <owen () delong com>]

Sometimes you don't want to have your application exposed to an unconstrained wait outside
of your control.

Sometimes your application may not have access/permissions/etc. to open sockets. (This is actually
a common security precaution in some CGI environments).

Owen

On Mar 12, 2012, at 4:22 PM, Jeroen van Aart wrote:

> Owen DeLong wrote:
> > http://en.wikipedia.org/wiki/Email_address#Valid_email_addresses
> > You may have noticed my particular test wouldn't accept foo!bar!ucbvax!user format addresses, either.
> > It works well enough for my purposes. I did not claim it was perfect.
>
> Why not leave it to the MTA to decide what is a valid address? It only requires a few SMTP commands to the MTA to 
> know if it will accept it. Normally the MTA will tell you after the "rcpt to:" command if it will accept it (i'm 
> ignoring some badly behaving MTAs who will swallow anything and then bounce, no point trying to work around such 
> crap).
>
> No need to re-invent the wheel, unless you're actually creating an MTA or something similar.
>
> Who is to say that even IF your address verifier verifies it as valid that the MTA is configured to allow it (or the 
> other way around)? MTAs can be arbitrarily configured to (dis)allow "bang path" addresses, IP addresses etc.
>
> Regards,
> Jeroen
>
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