id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
16166	EmailField? does not comply with SMTP standard	qqq1one@…	nobody	"Email addresses in the literal form (where the square brackets are included):

    user@[123.123.123.123]

are indicated as invalid by EmailField.

But the literal form is valid as per section 4.1.3 of the SMTP standard:

   Sometimes a host is not known to the domain name system and
   communication (and, in particular, communication to report and repair
   the error) is blocked.  To bypass this barrier a special literal form
   of the address is allowed as an alternative to a domain name.  For
   IPv4 addresses, this form uses four small decimal integers separated
   by dots and enclosed by brackets such as [123.255.37.2], which
   indicates an (IPv4) Internet Address in sequence-of-octets form.

Reference: [http://tools.ietf.org/html/rfc2821#section-4.1.3]

Also referred to in [http://tools.ietf.org/html/rfc1123#page-57]:

  5.2.17  Domain Literals: RFC-822 Section 6.2.3

         A mailer MUST be able to accept and parse an Internet domain
         literal whose content (""dtext""; see RFC-822) is a dotted-
         decimal host address.  This satisfies the requirement of
         Section 2.1 for the case of mail.

         An SMTP MUST accept and recognize a domain literal for any of
         its own IP addresses.

"	Bug	closed	Core (Mail)	dev	Normal	fixed	EmailField SMTP compliance		Ready for checkin	1	0	0	0	0	0