[Kde-pim] Review Request: Return error when email address ends with '.'

[Ingo Klöcker]

On Thursday 27 August 2009, Gary L. Greene, Jr. wrote:
> On Wednesday 26 August 2009 10:17:35 pm Torgny Nyblom wrote:
> > On Wednesday 26 August 2009 20:33:09 you wrote:
> > > On 8/26/09 11:08 AM, "Martin Koller" <kollix at aon.at> wrote:
> > > > On Wednesday 26 August 2009, Torgny Nyblom wrote:
> > > >> Check if an email address ends with '.'. If this is the case
> > > >> return an error. Add unit tests for this as well as for the
> > > >> "isValidAddressList()" function.
> > > >
> > > > I think it is valid that an email address's domain ends with a
> > > > "." Have a look at RFC 1035
> > >
> > > This is legal according to the RFCs since email clients are
> > > supposed to treat this no differently than DNS clients.
> >
> > I've been looking at that RFC but I cannot find were it says that
> > "user at domain.tld." should be a vaild email address. Could you point
> > me to where this is specified?
>
> As this is defined in RFC 3696,
> http://tools.ietf.org/html/rfc3696#page-5 , The domain portion must
> be a valid domain address that is understood by DNS for the express
> purpose of discovering the MX for a given network. These are of
> course defined in RFC 1035 that the trailing . is legal.

In fact, the trailing period is not just legal, it even has a special 
semantic.

RFC 3696, section 2 (Restrictions on domain (DNS) names) reads
   [...] The DNS specification also
   permits a trailing period to be used to denote the root, e.g.,
   "a.b.c" and "a.b.c." are equivalent, but the latter is more explicit
   and is required to be accepted by applications. [...]

(cf. http://tools.ietf.org/html/rfc3696#page-4)


So, the change should be reverted/rejected.


Regards,
Ingo
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