我曾经使用gmail从我的symfony2应用程序发送邮件。但是现在google似乎阻止了这项服务，而当我尝试使用SwiftMailer发送邮件时，我收到以下消息给我的gmail帐户：
Someone just tried to sign in to your Google Account xxx@gmail.com from an app that doesn't meet modern security standards.
Details:
Saturday, November 7, 2015 9:26 PM (Central European Standard Time)
France*
We strongly recommend that you use a secure app, like Gmail, to access your account. All apps made by Google meet these security standards. Using a less secure app, on the other hand, could leave your account vulnerable. Learn more.
Google stopped this sign-in attempt, but you should review your recently used devices:
现在，如果不是谷歌我应该用什么来发送邮件？
注意：我需要一些免费的东西