The code I am using I found here:
http://iphoneapp-dev.blogspot.com/2010/10/email-validation-in-iphone-application.html
-(BOOL)validateEmail:(NSString*)email{

if( (0 != [email rangeOfString:@"@"].length) &&  (0 != [email rangeOfString:@"."].length) )
{
NSMutableCharacterSet *invalidCharSet = [[[[NSCharacterSet alphanumericCharacterSet] invertedSet]mutableCopy]autorelease];
[invalidCharSet removeCharactersInString:@"_-"];

NSRange range1 = [email rangeOfString:@"@" options:NSCaseInsensitiveSearch];

// If username part contains any character other than "."  "_" "-"

NSString *usernamePart = [email substringToIndex:range1.location];
NSArray *stringsArray1 = [usernamePart componentsSeparatedByString:@"."];
for (NSString *string in stringsArray1) {
NSRange rangeOfInavlidChars=[string rangeOfCharacterFromSet: invalidCharSet];
if(rangeOfInavlidChars.length !=0 || [string isEqualToString:@""])
return NO;
}

NSString *domainPart = [email substringFromIndex:range1.location+1];
NSArray *stringsArray2 = [domainPart componentsSeparatedByString:@"."];

for (NSString *string in stringsArray2) {
NSRange rangeOfInavlidChars=[string rangeOfCharacterFromSet:invalidCharSet];
if(rangeOfInavlidChars.length !=0 || [string isEqualToString:@""])
return NO;
}

return YES;
}
else // no '@' or '.' present
return NO;
}

There is a thread on Stackoverflow suggesting another validation:
+(BOOL) validateEmail: (NSString *) email {
 NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
 NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
 BOOL isValid = [emailTest evaluateWithObject:email];
 return isValid;
}</code>

					

			

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