Add an email signature to your messages this can reinforce your brand identity and build trust.

http://beehive.instructure.com/eportfolios/4869/Cobi_Abrams_Tanks_For_Sale__Cipla__Pain_Management_
http://mcook.instructure.com/eportfolios/38051/MagJack_250_Mg_Drugs__Magnum_Pharmaceuticals__Injectable_Steroids

縺ゅ縺 メッセージ
You never need to include one when citing journal articles, e-books, or other stable online sources.