Net Income Per Share - (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Notes to Financial Statements
Net income attributable to SMTP.com	$ 240,228	$ 202,927	$ 445,056	$ 360,289
Basic weighted average common shares outstanding	13,840,264	14,339,434	14,090,467	13,703,743
Add incremental shares for:
Warrants	547,089			330,957
Stock options	1,097,552	819,582	884,224	851,313
Diluted weighted average common shares outstanding	15,159,016	15,484,904	14,974,691	14,886,013
Net income per share:
Basic	$ 0.02	$ 0.01	$ 0.03	$ 0.03
Diluted	$ 0.02	$ 0.01	$ 0.03	$ 0.02