Help! "From" format on emails

Help! "From" format on emails

I noticed that the "from" line on emails no longer is just the name@website.com...

Why is it now read "on behalf of"??? it's also very,very long... It gives the appearance of SPAM in my opinion.

How do I change it back to just my email address only? 

Thanks!

Example:

first.last=site.com@sender.zohocrm.com; on behalf of; first.last <myname@site.com>