troubleshooting Question

are e-mail addresses "capital" letter sensitive?

Avatar of nickg5
nickg5Flag for United States of America asked on
Internet / Email SoftwareMiscellaneous
14 Comments2 Solutions11863 ViewsLast Modified:
I've been expecting to hear from someone since yesterday.
I decided to view their website and there was a link to send an e-mail.
Well, I had their business card and it was an address. The user name was 3 words, so 3 words at The middle word on the business card was in capital letters.
I sent the e-mail from my Hotmail address. Hours go by and no reply,
This person stands to earn a commission for their help on some real estate so I went to my "sent" box to read over the message I sent them.
The "to" box, shows the 3 words but none of the letters are capitalized.
So, I go back to the website and there is a link to send an e-mail. The address shown there is the same three words at and the first letter in each word is capitallized.

I can not be a pest by calling this person, so I want to know if my e-mail sent to: got delivered, though when I look at my message in my Hotmail "sent folder" it shows that my message went to

Are e-maail addresses capital letter sensitive?

I would guess no, since the business card says:
and the website says
and they are the same 3 words, so it seems illogical to have multiple e-mail addresses all with varying capital letters.

I happen to be on a computer which has Windows Mail but I'm not logged in for e-mail and can not. When I clicked on the e-mail address on the person's website, of course Vista tried to open Windows Mail. And though I can not send an e-mail from there, it has the "new message" box open and has the e-mail addres in the box and it is: which matches "exactly" what the website says.

When I sent my message to from my hotmail address, why does the sent copy show that the destination was


Our community of experts have been thoroughly vetted for their expertise and industry experience.

Join our community to see this answer!
Unlock 2 Answers and 14 Comments.
Start Free Trial
Learn from the best

Network and collaborate with thousands of CTOs, CISOs, and IT Pros rooting for you and your success.

Andrew Hancock - VMware vExpert
See if this solution works for you by signing up for a 7 day free trial.
Unlock 2 Answers and 14 Comments.
Try for 7 days

”The time we save is the biggest benefit of E-E to our team. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange.

-Mike Kapnisakis, Warner Bros