Outbox

Outbox is an on-the-go email composer that lets you send pre-customized emails while on the move. Wishing someone a Birthday or requesting a follow-up meeting with a client can now be done on-the-fly without struggling for right words. Just fill in with recipient names and other detail and you have a email ready to go in less than a few clicks.
So, no more Writer’s Block, we make it easy to stay in touch with right people in just the right words. This packed with convenience while being on the move or a prompter turn-around on an email without the hassle of typing long sentences on a touch-screen.

Some cool features like
Easy access to most commonly used template,
Categorization of Personal-use or Official-use templates
Send an email from available iphone contacts
Integration with your Email Accounts already set up in your iPhone
Use your pre-configured Iphone Signature with every outgoing email