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Old 25 May 2021, 10:20 AM   #1
Join Date: Jul 2014
Posts: 42
Valid Email Addresses

Interesting -- well, I found it interesting -- article on what constitutes a valid email address. I did not know:

The RFC is rather specific here, and mandates that the local part MUST BE treated as case sensitive.
I wonder if there are any email providers who would allow [email protected] and [email protected] to point to different inboxes.

For the full article:
Folio is offline   Reply With Quote

Old 25 May 2021, 10:49 PM   #2
The "e" in e-mail
Join Date: Feb 2006
Location: EU
Posts: 4,820
There are many web pages asking for an email address that reject legitimate entries. And I'm not talking about "<>" or ".jdoe"@[IPv6:2011:470:30:84:a276:63ff:ef72:3888]. I mean quite often plus addressing is disallowed
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Old 25 May 2021, 11:17 PM   #3
Master of the @
Join Date: Feb 2017
Posts: 1,141
I suspect very few honor the upper/lowercase difference. Would cause too much confusion. I receive forms every day from people and many type in the their addresses incorrectly to the point I have to look them up sometimes, but one of the funny things is how often people omit capital letters or type in all caps.
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Old 29 Jun 2021, 10:09 PM   #4
The "e" in e-mail
Join Date: Jun 2004
Location: in between the bright lights and the far unlit unknown
Posts: 2,275
I always learnt that upper case or lower case characters make no difference in email addresses. Unless there's a recent technological change of some sort, it makes no difference if you writer [email protected] or [email protected]

Upper case or lower case can make a difference in URL's.
Tsunami is offline   Reply With Quote

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