MFMailComposeViewController *exporter = [[MFMailComposeViewController alloc] init];
exporter.mailComposeDelegate = self;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *dataPath = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"data.txt"];
NSData *data = [NSData dataWithContentsOfFile:dataPath];
[exporter addAttachmentData:data mimeType:@"text/txt" fileName:@"data.txt"];
NSString *emailBody = @"Body";
[exporter setMessageBody:emailBody isHTML:NO];
[exporter setSubject:@"Subject"];
[self presentModalViewController:exporter animated:YES];
[exporter release];