Q: cannot get mail connection to server failed

Hello, dot.mac.  

Thank you for visiting Apple Support Communities.  

I understand that you are unable to receive mail on your iPhone.  I would need a little more information on what type of mail account this is to provide a better answer.  However, here are a couple troubleshooting articles that may help with this issue.  

Get help with Mail on iPhone, iPad, and iPod touch

Gmail account cannot get or send email in iOS

Cheers, 

Jason H.