Symfony 2, SwiftMailer and 1und1 shared hosting

At the moment I playing around with Smfony2. One of the things I wanted to do is sending an email via form. Therefore of course I used Swift_Mailer component which worked very good in local dev environment. But after deploying to 1und1 hosted webspace I received error that neither localhost nor could be connected to from the webspace.

After lots of research I found out that the mailserver hostname is and then it worked.

I hope that this saves someone some hours or minutes.

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  1. With your hint, I was able to set up symfony mailing on 1&1 with 1&1 mail account. Using mailer_transport: mail and as you said mailer_host:, using port 25 and tls encryption.

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