Using CiviCRM 1.9.12432 on Joomla there is a typo in Admin / Settings / SMTP Configuration / SMTP Port help text which reads:
"The standard STMP port is 25. You should only change that value if your SMTP server is running on a non-standard port."
Note the first STMP not SMTP. I use the en_GB mo files but suspect that this is in the default US english version too. I know its a really trivial thing....