Fix: Fix sendmail symlink detection for macOS (#514)

main.go

@@ -1,3 +1,4 @@
+// Package main is the entrypoint
 package main
 
 import (
@@ -10,26 +11,11 @@ import (
 )
 
 func main() {
-	exec, err := os.Executable()
-	if err != nil {
-		panic(err)
-	}
-
-	// running directly
-	if normalize(filepath.Base(exec)) == normalize(filepath.Base(os.Args[0])) ||
-		!strings.Contains(filepath.Base(os.Args[0]), "sendmail") {
-		cmd.Execute()
-	} else {
-		// symlinked as "*sendmail*"
+	// if the command executable contains "send" in the name (eg: sendmail), then run the sendmail command
+	if strings.Contains(strings.ToLower(filepath.Base(os.Args[0])), "send") {
 		sendmail.Run()
+	} else {
+		// else run mailpit
+		cmd.Execute()
 	}
 }
-
-// Normalize returns a lowercase string stripped of the file extension (if exists).
-// Used for detecting Windows commands which ignores letter casing and `.exe`.
-// eg: "MaIlpIT.Exe" returns "mailpit"
-func normalize(s string) string {
-	s = strings.ToLower(s)
-
-	return strings.TrimSuffix(s, filepath.Ext(s))
-}