Net Income Per Share - (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Notes to Financial Statements
Net income attributable to SMTP.com	$ 313,854	$ 344,096	$ 758,910	$ 704,384
Basic weighted average common shares outstanding	14,707,250	13,841,500	14,297,562	13,750,672
Add incremental shares for:
Warrants		471,390		401,317
Stock options	551,593	1,031,537	598,986	939,079
Diluted weighted average common shares outstanding	15,258,843	15,344,427	14,896,548	15,091,068
Net income per share:
Basic	$ 0.02	$ 0.02	$ 0.05	$ 0.05
Diluted	$ 0.02	$ 0.02	$ 0.05	$ 0.05