feat(cli): add test-email command to check mail capability

cmd/email/test_email.go

@@ -0,0 +1,41 @@
+package email
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+
+	"github.com/spf13/cobra"
+	"stackroost/internal/logger"
+)
+
+
+var TestEmailCmd = &cobra.Command{
+	Use:   "test-email",
+	Short: "Check if email capability is available on this system (mail/sendmail/msmtp)",
+	Run: func(cmd *cobra.Command, args []string) {
+		mailers := []string{"mail", "sendmail", "msmtp"}
+		found := false
+
+		for _, bin := range mailers {
+			_, err := exec.LookPath(bin)
+			if err == nil {
+				logger.Success(fmt.Sprintf("Mailer available: %s", bin))
+				found = true
+			}
+		}
+
+		if !found {
+			logger.Warn("No mail sending utilities found (mail/sendmail/msmtp)")
+			logger.Info("You can install one, e.g., `sudo apt install mailutils` or `sendmail`")
+			os.Exit(1)
+		}
+
+		logger.Info("Email sending capability appears to be available")
+	},
+}
+
+func init() {
+	TestEmailCmd.Flags().String("to", "", "Recipient email address")
+	TestEmailCmd.MarkFlagRequired("to")
+}

cmd/root.go

@@ -11,6 +11,7 @@ import (
 	"strings"
 	"stackroost/cmd/ssl"
 	"stackroost/cmd/logs"
+	"stackroost/cmd/email"
 )
 
 var rootCmd = &cobra.Command{
@@ -211,7 +212,8 @@ func init() {
 	createDomainCmd.Flags().Bool("ssl", false, "Enable Let's Encrypt SSL (Apache/Nginx only)")
 	createDomainCmd.MarkFlagRequired("name")
 	rootCmd.AddCommand(ssl.CheckSSLExpiryCmd)
-		rootCmd.AddCommand(logs.AnalyzeTrafficCmd)
+	rootCmd.AddCommand(logs.AnalyzeTrafficCmd)
+	rootCmd.AddCommand(email.TestEmailCmd)
 }
 
 func Execute() {