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Old 25 May 2021, 11:20 AM   #1
Folio
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Join Date: Jul 2014
Posts: 76
Valid Email Addresses

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

Quote:
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 USER@domain.tld and user@domain.tld to point to different inboxes.

For the full article:
https://www.netmeister.org/blog/email.html
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Old 25 May 2021, 11:49 PM   #2
janusz
The "e" in e-mail
 
Join Date: Feb 2006
Location: EU
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There are many web pages asking for an email address that reject legitimate entries. And I'm not talking about "<>"@example.com or ".jdoe"@[IPv6:2011:470:30:84:a276:63ff:ef72:3888]. I mean quite often plus addressing is disallowed
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Old 26 May 2021, 12:17 AM   #3
TenFour
Master of the @
 
Join Date: Feb 2017
Location: USA
Posts: 1,679
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, 11:09 PM   #4
Tsunami
The "e" in e-mail
 
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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 USER@domain.tld or user@domain.tld

Upper case or lower case can make a difference in URL's.
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