Hello...........

sir, actually it is an hoax message everyone are getting in their mails. Just search in google. He is no way connected to Margaret Hello.  The use of hello as a telephone greeting has been credited to Thomas Edison; according to one source, he expressed his surprise with a misheard Hullo

Last line source - Wikipedia

Hi v @ m$h!
 

I think u r right on the basis of answer in wikipedia, but the below link and on rediff website show the posting as mentioned below.

https://www.indiastudychannel.com/resources/131815-The-word-hello.aspx

"In our daily life we are causally using the word "hello" while answering the phone calls.Actually the word "hello" came into existence by Alexander graham bell, the inventor of telephone. Hello is the name of Alexander graham bell's girlfriend called Margaret Hello.
We might have forgot Alexander graham bell but not his girlfriend."

However, in some websites the "hello" is connected with Thomas Edison. It is a bit of great confusion. Any way thanks for intimating.