Who is Mail not allowing me to add email address?

Question

Hello,
I am having trouble with "Mail" i was wondering if any one of you guys can help.
I am trying to add my Office 360 email on mail, i added it on my iPhone but can't seem to add it on my Mac. It is coming up with an error saying "Please fill out the email address field correctly.....".
I am assuming because my website (lets call it xxx) is not .com or .net instead .Digital extension.
Help! thank you!

Answer 1

I've tried the paper clip attach button in the new mail window, right mouse on file in Finder, compress and email. Nothing works.
Drag and drop will create a link to the file and show an icon but its only a link, not the actual file. If I send this, the recipient cannot open the file as the raw source is like this:
Content-Type: multipart/mixed; boundary="Apple-Mail=_195D65EC-57CA-455D-968D-E9471492BEDA"
Subject:
Message-Id: <[email protected]>
Date: Tue, 5 Feb 2013 16:47:08 +1100
To: xxxxx
Mime-Version: 1.0 (Mac OS X Mail 6.2 \(1499\))
X-Mailer: Apple Mail (2.1499)
X-Optus-CM-Score: 0
X-Optus-CM-Analysis: v=2.0 cv=Uug7rJMB c=1 sm=1 a=PO7r1zJSAAAA:8
          a=WzHNiX6cKY2DZ1D7HSYA:9 a=l+cP1Rjl1oAS4T2Qo3RCSw==:117
--Apple-Mail=_195D65EC-57CA-455D-968D-E9471492BEDA
Content-Disposition: inline;
          filename=ContractofSale.pdf
Content-Type: application/pdf;
          name="ContractofSale.pdf"
Content-Transfer-Encoding: 7bit
--Apple-Mail=_195D65EC-57CA-455D-968D-E9471492BEDA--