I stand corrected. Another "factoid" learned long ago.
I did a bit more research and agree that there are multiple interpretations about punctuation characters in the part of the email address before the "@". However, it is considered by some as a good belt and suspenders plan to do some filtering for Gmail email addresses for "." and "+".
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Gerald
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On Thu, Jul 26, 2018 at 10:17 PM, Shal Farley wrote:
Gerald,
> I always understood that dots and some other punctuation are ignored
> in email addresses.
No.
So long as it is syntactically correct the email standard leaves the
semantic interpretation of the user name part entirely up to the
receiving domain.
To get it completely correct Groups.io would need a table of exceptions
by domain to know which characters to ignore or otherwise treat specially.
For example, some mail services (IIRC Gmail) allowed the use of a plus
sign in an email address to ignore the plus sign and all following
characters. This was touted as a cheap way to get disposable email
addresses for the purpose of giving different vendors different
addresses so as to know which vendor sold you address.
That usage I think inspired Groups.io's use of plus as a command
lead-in. As opposed to Y!Groups use of hyphen.
> If GIO is considering them different, I guess that could be considered
> a bug.
It would be a far worse error to consider them the same with a domain
that doesn't. Then you'd have two or more users who can't separate their
accounts.
Shal
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Gerald
