On Tue, 8 May 2012, Martin Lambers wrote:
>> To: "localpart."@domain
>
> Is that really valid? Can you point to to some standard that allows
> this?
It looks odd, but I think RFC5322 (and RFC2822) allows this. Moreover, if
I understand correctly, it not just allows, but specifies that it has to
be double-quoted (because it ends with a dot).
Chapter 3.4 says that an address can be an addr-spec:
address = mailbox / group
mailbox = name-addr / addr-spec
Chapter 3.4.1 defines addr-spec as:
addr-spec = local-part "@" domain
local-part = dot-atom / quoted-string / obs-local-part
dot-atom = [CFWS] dot-atom-text [CFWS]
dot-atom-text = 1*atext *("." 1*atext)
quoted-string = [CFWS]
DQUOTE *([FWS] qcontent) [FWS] DQUOTE
[CFWS]
In our case local-part is not a dot-atom, but a quoted-string.
RFC5321 (and RFC2821) says similarly:
Mailbox = Local-part "@" ( Domain / address-literal )
Local-part = Dot-string / Quoted-string
Dot-string = Atom *("." Atom)
Quoted-string = DQUOTE *QcontentSMTP DQUOTE
Istvan
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