Use Gmail Ids in different ways

You can put dot anywhere in your ID
i.e, hnprashanth@gmail.com as hn.prashanth@gmail.com, h.n.p.r.a.s.h.a.n.t.h@gmail.com
if u give these Id to anyone mail will come to your inbox only
If your frnd ask your ID impress him/her by giving ID like YourID+frnds name@gmail.com
ex: To my frnd Vinay i could give ID as hnprashanth+vinay@gmail.com……again mails comes 2 u’r inbox only
also like hnprashanth+how+are+you@gmail.com
No need to change settings anywhere,just try sending mail from other ID to gmail…..u will be amazed…
One more option is yourID@googlemail.com .