iRedMail-0.8.3 Configuration Problem

[Ashoksmclain]

Hi,
I have a problem which i am not able to solve for over a month,
I have installed iRedMail-0.8.3 over Ubuntu 12.04 LTS,
i have used mail.example.com as host name, but example.com uses google apps and i have added two domains - example1.com & example2.com,

where as if i try to send mail to any gmail account from the two domains (example1.com & example2.com) the mail bounces back with this error:

lost connection with
alt4.gmail-smtp-in.l.google.com[173.194.75.27] while receiving the initial
server greeting

I have use namecheap as my domian register and i use their dns server

i have a static IP & ReverseDNS is also set to mail.example.com

Please help me setting spf record & dkim record for all the domains please

Please help me to solve this,