Email opening problem

[Jack Ass]

Hello,

I am quality assurance specialist. I am creating automatic tests and today I encountered with a problem related to Jenkins. With Selenium Eclipse I created automatic test for registration to website: opening website, filling register information. After that opening new tab, fill gmail information, open email letter and push register confirmation link. Everything on Selenium works fine. But when I run my test on Jenkins it fails. It doesn't open registration confirmation email. It does all the steps till it: open website, fill register information, opens new tab, logins to gmail account and what's it. After that it has to open confirmation email, but nothing is going on. I am running the newest version of Jenkins. 

Sorry for my not fluent English language, but I hope you will understand the problem. Thanks and will be waiting for answer. 

I am adding my source code to make it more clear: