[dns-operations] email address in SOA
daniel at digsys.bg
Thu Dec 6 08:57:41 UTC 2012
On 06.12.12 06:29, Phil Pennock wrote:
> Gmail offers what was, at the time they introduced it, an _unusual_
> canonicalisation, which may have become more widespread now. It makes
> a lot of sense. Gmail says that, for mail to one of their domains,
> dots are not significant and canonicalise away. They're not wildcards,
> they're just noise that's skipped. So phil.pennock and philpennock are
> the same LHS. The dots from account sign-up are just remembered for
> presenting as the normal form of the address.
Just for the record, Gmail (Google) hardly invented this notation. Gmail
launched in like... 2004? About 15 years earlier (my memory) we had
email systems employing it. Out of practical considerations: the UNIX
login name field cannot contain dots so any account would be created
without the dots, even if the requested e-mali address was supposed to
have dots. Dots in LHS were handled via sendmail aliasing. I am talking
about atomated e-mail provisioning systems, not handcrafting sendmail.cf.
As a side effect, when sending to that sendmail instance, both
user.name at some.domain and username at some.domain would work (as long as
username is under 16 characters long).
I believe this was widespread enough before Google ever existed and will
likely be widespread long after they are history.
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