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Capital Letters (PascalCasing) in Email Addresses
Advantages and Disadvantages

 1:48 am on May 21, 2008 (gmt 0)

In a recent Home Page Topic posted by dailypress, we had a great discussion on...

Capital Letters (Pascal Casing) in URLs - Advantages and Disadvantages

I'd like to expand that discussion and talk about the use of PascalCasing in Email Addresses. We know domain names are case insensitive. We also know that email names (before the @) are case insensitive for the most part, there are exceptions to this and they are few and far between from what I understand.

Internet Message Format

The local part of an email address (that which precedes the @ symbol) may contain any of the below ASCII characters.

Uppercase and lowercase letters
The digits 0 through 9
The characters ! # $ % * / ? ^ { } ` ~ & ' + - = _
The character . provided that it is not the first nor last character in the local-part, nor may it appear two or more times consecutively.

^ Emphasis mine.

Are you using PascalCasing with your email communications?

Do you print your email address in PascalCase? FirstLast@Example.com

How many "email bloopers" have you seen due to all lower case? How many of those "email bloopers" could be avoided if PascalCasing were utilized?

Of course we need to discuss the Advantages and Disadvantages just as we did in the topic above. I don't see many Disadvantages myself, do you? We're dealing primarily with an area that is normally case insensitive. I know there are a few million AOL users who would disagree with that statement, but its true. :)



 2:45 am on May 22, 2008 (gmt 0)

Dealing with thousands of MS Exchange users' addresses I'd always forced lower case in my lists for a corporate Intranet. That had been done for consistency in the display. I wasn't aware that any e-mail systems were case sensitive.


 4:03 pm on May 22, 2008 (gmt 0)

According to RFC 2821 [faqs.org], the mailbox can be case sensitive. However, it is discouraged as it impedes interoperability.

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