solve rsforms sendmail problem

I have this website:

when you fill out the form and click the button, you get to a 404 page, instead of getting the "thank you" messege.

i am using sendmail with smtp.gmail.com, but it doesn't work as well (only with phpmailer).

i would like to use send mail with google & solve the thank you page problem.

here is a simple translation:

http://screencast.com/t/sj3It8zpq

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Awarded tnexpert Rating: (9.8) 372 reviews, 98 % positive No test taken. Provider can take tests at Test center to certify their skills. Certified tests: 0 Earning: US$ 103481.75	US $ 40.00	1 days	View/Post PM
	expert in joomla! Bid ID:1183273515 - Bid time:30/Jan/2012 at 01:38:47 Report
veridical Rating: (7.7) 13 reviews, 77 % positive English Spelling Test (U.S. Version) 75% Microsoft Office PowerPoint 2003 Test 65% Computer Skills Test 62% English Language (Words and Phrases) Test 62% Certified tests: 4 Earning: US$ 1585.00	US $ 80.00	1 days	View/Post PM
	Hi, We are a team of open source solutions provider. Please check your PM for other details. Regards, Veridical. Bid ID:1183273514 - Bid time:30/Jan/2012 at 01:33:47 Report
webcherrysolutions Rating: (10) 11 reviews, 100 % positive PHP5 Test 68% Certified tests: 1 Earning: US$ 515.00	Prebid	Prebid	View/Post PM
	Hello Sir, Let me allow to work on this. Thanks & Regards; ViAvi WebTech Bid ID:1183273513 - Bid time:30/Jan/2012 at 01:27:24 Report

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