MFMailComposeViewController *mailController = [[MFMailComposeViewController alloc] init];
[mailController setMailComposeDelegate:self];
[mailController setSubject:@"Mail Subject!"];
[mailController setMessageBody:@"Here is your message body" isHTML:NO];
[mailController setToRecipients:[NSArray arrayWithObject:@"yourrecipent@domain.com"]];

NSData *imageData = UIImageJPEGRepresentation(imageToUpload, 1.0f);
if(imageData.length)
{
    [mailController addAttachmentData:imageData mimeType:@"image/jpeg" fileName:@"Your_Photo.jpg"];
    [self presentModalViewController:mailController animated:YES];
}
else
{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Invalid Image" message:@"The image couldn't be converted." delegate:nil cancelButtonTitle:nil otherButtonTitles:@"Okay", nil];
    [alert show];
}