diff --git a/userli.go b/userli.go
index b380011..6ebc632 100644
--- a/userli.go
+++ b/userli.go
@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/http"
+	"strings"
 	"time"
 )
 
@@ -30,6 +31,10 @@ func NewUserli(token, baseURL string) *Userli {
 }
 
 func (u *Userli) GetAliases(email string) ([]string, error) {
+	if !strings.Contains(email, "@") {
+		return []string{}, nil
+	}
+
 	resp, err := u.call(fmt.Sprintf("%s/api/postfix/alias/%s", u.baseURL, email))
 	if err != nil {
 		return []string{}, err
@@ -60,6 +65,10 @@ func (u *Userli) GetDomain(domain string) (bool, error) {
 }
 
 func (u *Userli) GetMailbox(email string) (bool, error) {
+	if !strings.Contains(email, "@") {
+		return false, nil
+	}
+
 	resp, err := u.call(fmt.Sprintf("%s/api/postfix/mailbox/%s", u.baseURL, email))
 	if err != nil {
 		return false, err
@@ -75,6 +84,10 @@ func (u *Userli) GetMailbox(email string) (bool, error) {
 }
 
 func (u *Userli) GetSenders(email string) ([]string, error) {
+	if !strings.Contains(email, "@") {
+		return []string{}, nil
+	}
+
 	resp, err := u.call(fmt.Sprintf("%s/api/postfix/senders/%s", u.baseURL, email))
 	if err != nil {
 		return []string{}, err
diff --git a/userli_test.go b/userli_test.go
index b86f0e0..7fcbfdf 100644
--- a/userli_test.go
+++ b/userli_test.go
@@ -37,6 +37,12 @@ func (s *UserliTestSuite) TestGetAliases() {
 		s.Equal([]string{"source1@example.com", "source2@example.com"}, aliases)
 	})
 
+	s.Run("no email", func() {
+		aliases, err := s.userli.GetAliases("alias")
+		s.NoError(err)
+		s.Empty(aliases)
+	})
+
 	s.Run("error", func() {
 		gock.New("http://localhost:8000").
 			Get("/api/postfix/alias/alias@example.com").
@@ -120,6 +126,12 @@ func (s *UserliTestSuite) TestGetMailbox() {
 		s.True(gock.IsDone())
 	})
 
+	s.Run("no email", func() {
+		active, err := s.userli.GetMailbox("user")
+		s.NoError(err)
+		s.False(active)
+	})
+
 	s.Run("not found", func() {
 		gock.New("http://localhost:8000").
 			Get("/api/postfix/mailbox/user@example.org").
@@ -170,6 +182,12 @@ func (s *UserliTestSuite) TestGetSenders() {
 		s.True(gock.IsDone())
 	})
 
+	s.Run("no email", func() {
+		senders, err := s.userli.GetSenders("user")
+		s.NoError(err)
+		s.Empty(senders)
+	})
+
 	s.Run("alias success", func() {
 		gock.New("http://localhost:8000").
 			Get("/api/postfix/senders/alias@example.com").