Net Income Per Share (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net Income Per Share [Abstract]
Net income attributable to SMTP.com	$ 223,372	$ 225,570
Basic weighted average common shares outstanding	4,239,363	2,958,113
Add incremental shares for:
Warrants	32,778	17,292
Stock options	30,302	218,667
Diluted weighted average common shares outstanding	4,302,443	3,194,072
Net income per share:
Basic	$ 0.05	$ 0.08
Diluted	$ 0.05	$ 0.07