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Subject: Re: URLs containing `?' are not fully comprehended
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arne+usenet@daimi.au.dk (Arne J=F8rgensen) writes:

> > The following is a legitimate URL.
> >=20
> > mailto:him@over.there?subject=3Dtesting
>=20
> Are you sure? I thought it was just a Netscape and InternetExplorer
> 'feature' ?

No, the syntax is described in rfc2368:

 mailtoURL  =3D  "mailto:" [ to ] [ headers ]
 to         =3D  #mailbox
 headers    =3D  "?" header *( "&" header )
 header     =3D  hname "=3D" hvalue
 hname      =3D  *urlc
 hvalue     =3D  *urlc

And #mailbox is of course one or more rfc822-"mailbox", so the problem
of recognizing mailto URLs is not simple.