They might have been looking at RFC 2821
Well, that would be odd, certainly.
On the other hand, I'm not finding text in RFC 2821 (searching only for
FQDN) that asserts the limitation. Pointer please?
Assembled from the bits of grammar in 2821:
"RCPT TO:" ("<Postmaster@" domain ">" / "<Postmaster>" /
Forward-Path) [SP Rcpt-parameters] CRLF
Forward-path = Path
Path = "<" [ A-d-l ":" ] Mailbox ">"
Mailbox = Local-part "@" Domain
Domain = (sub-domain 1*("." sub-domain)) / address-literal
---
RFC 5321 makes "Domain" this:
Domain = sub-domain *("." sub-domain)
...which allows the dotless option.
Barry
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