diff --git a/src/main.rs b/src/main.rs
index 49780d4..741c51e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -106,6 +106,15 @@ fn validate_email(email: &String) -> bool {
     Regex::new(r"^[a-zA-Z0-9\.\-_]+@[a-zA-Z0-9\-\.]+\.[a-zA-Z]+$").unwrap().is_match(email)
 }
 
+fn validate_guests(guests: &u8) -> bool {
+    // Check if the default number of guests (255) changed.
+    if guests < &255 {
+        true
+    } else {
+        false
+    }
+}
+
 fn strip_tld(url: &str) -> Option<String> {
     // Get the top level domain which is used to determine the language
 
@@ -204,7 +213,7 @@ fn submit_task (host: HostHeader,
         Some(x) => {
             // Check input for anything strange or something that does not look like
             // an email address.
-            if validate_name(&x.name) && validate_email(&x.email) {
+            if validate_name(&x.name) && validate_email(&x.email) && validate_guests(&x.guests){
                 // Create HashMap to use with strfnt
                 let mut vars = HashMap::new();
                 vars.insert("name".to_string(), &x.name);
@@ -255,7 +264,7 @@ fn submit_task (host: HostHeader,
                         &settings);
                 }
             } else {
-                result = Err("Validate e-mail or name went wrong.".to_string());
+                result = Err("Validate e-mail, name, or number of guests went wrong.".to_string());
             }
 
             // Send a message to the sender's e-mailaddres to inform about