diff --git a/.env b/.env
index 8162f629..785ddba8 100644
--- a/.env
+++ b/.env
@@ -46,6 +46,7 @@ MF_USERS_DB=users
 MF_USERS_ADMIN_EMAIL=admin@example.com
 MF_USERS_ADMIN_PASSWORD=12345678
 MF_USERS_RESET_PWD_TEMPLATE=users.tmpl
+MF_USERS_PASS_REGEX=^.{8,}$
 
 ### Email utility
 MF_EMAIL_HOST=smtp.mailtrap.io
diff --git a/cmd/users/main.go b/cmd/users/main.go
index cbe8a33c..ddb48e93 100644
--- a/cmd/users/main.go
+++ b/cmd/users/main.go
@@ -12,6 +12,7 @@ import (
 	"net/http"
 	"os"
 	"os/signal"
+	"regexp"
 	"strconv"
 	"syscall"
 	"time"
@@ -63,6 +64,7 @@ const (
 	defEmailTemplate    = "email.tmpl"
 	defAdminEmail       = ""
 	defAdminPassword    = ""
+	defPassRegex        = "^.{8,}$"
 	defAdminGroup       = "mainflux"
 
 	defTokenResetEndpoint = "/reset-request" // URL where user lands after click on the reset link from email
@@ -89,6 +91,7 @@ const (
 
 	envAdminEmail    = "MF_USERS_ADMIN_EMAIL"
 	envAdminPassword = "MF_USERS_ADMIN_PASSWORD"
+	envPassRegex     = "MF_USERS_PASS_REGEX"
 
 	envEmailHost        = "MF_EMAIL_HOST"
 	envEmailPort        = "MF_EMAIL_PORT"
@@ -123,6 +126,7 @@ type config struct {
 	authTimeout   time.Duration
 	adminEmail    string
 	adminPassword string
+	passRegex     *regexp.Regexp
 }
 
 func main() {
@@ -175,6 +179,11 @@ func loadConfig() config {
 		log.Fatalf("Invalid value passed for %s\n", envAuthTLS)
 	}
 
+	passRegex, err := regexp.Compile(mainflux.Env(envPassRegex, defPassRegex))
+	if err != nil {
+		log.Fatalf("Invalid password validation rules %s\n", envPassRegex)
+	}
+
 	dbConfig := postgres.Config{
 		Host:        mainflux.Env(envDBHost, defDBHost),
 		Port:        mainflux.Env(envDBPort, defDBPort),
@@ -213,6 +222,7 @@ func loadConfig() config {
 		authTimeout:   authTimeout,
 		adminEmail:    mainflux.Env(envAdminEmail, defAdminEmail),
 		adminPassword: mainflux.Env(envAdminPassword, defAdminPassword),
+		passRegex:     passRegex,
 	}
 
 }
@@ -287,7 +297,7 @@ func newService(db *sqlx.DB, tracer opentracing.Tracer, auth mainflux.AuthServic
 
 	idProvider := uuid.New()
 
-	svc := users.New(userRepo, groupRepo, hasher, auth, emailer, idProvider)
+	svc := users.New(userRepo, groupRepo, hasher, auth, emailer, idProvider, c.passRegex)
 	svc = api.LoggingMiddleware(svc, logger)
 	svc = api.MetricsMiddleware(
 		svc,
diff --git a/pkg/sdk/go/users_test.go b/pkg/sdk/go/users_test.go
index 377dce95..c99a7498 100644
--- a/pkg/sdk/go/users_test.go
+++ b/pkg/sdk/go/users_test.go
@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"net/http"
 	"net/http/httptest"
+	"regexp"
 	"testing"
 
 	"github.com/mainflux/mainflux"
@@ -24,6 +25,10 @@ const (
 	invalidEmail = "userexample.com"
 )
 
+var (
+	passRegex = regexp.MustCompile("^.{8,}$")
+)
+
 func newUserService() users.Service {
 	usersRepo := mocks.NewUserRepository()
 	groupsRepo := mocks.NewGroupRepository()
@@ -32,7 +37,7 @@ func newUserService() users.Service {
 	emailer := mocks.NewEmailer()
 	idProvider := uuid.New()
 
-	return users.New(usersRepo, groupsRepo, hasher, auth, emailer, idProvider)
+	return users.New(usersRepo, groupsRepo, hasher, auth, emailer, idProvider, passRegex)
 }
 
 func newUserServer(svc users.Service) *httptest.Server {
diff --git a/scripts/run.sh b/scripts/run.sh
index 9ffc7799..666920cd 100755
--- a/scripts/run.sh
+++ b/scripts/run.sh
@@ -38,7 +38,7 @@ done
 ###
 # Users
 ###
-MF_USERS_LOG_LEVEL=info MF_EMAIL_TEMPLATE=../docker/users/emailer/templates/email.tmpl $BUILD_DIR/mainflux-users &
+MF_USERS_LOG_LEVEL=info MF_EMAIL_TEMPLATE=../docker/templates/users.tmpl $BUILD_DIR/mainflux-users &
 
 ###
 # Things
diff --git a/users/api/endpoint_test.go b/users/api/endpoint_test.go
index 70238cfc..7c60c94a 100644
--- a/users/api/endpoint_test.go
+++ b/users/api/endpoint_test.go
@@ -11,6 +11,7 @@ import (
 	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
+	"regexp"
 	"strings"
 	"testing"
 
@@ -27,17 +28,22 @@ import (
 
 const (
 	contentType  = "application/json"
+	validEmail   = "user@example.com"
 	invalidEmail = "userexample.com"
+	validPass    = "password"
+	invalidPass  = "wrong"
 )
 
 var (
-	user           = users.User{Email: "user@example.com", Password: "password"}
+	user           = users.User{Email: validEmail, Password: validPass}
 	notFoundRes    = toJSON(errorRes{users.ErrUserNotFound.Error()})
 	unauthRes      = toJSON(errorRes{users.ErrUnauthorizedAccess.Error()})
 	malformedRes   = toJSON(errorRes{users.ErrMalformedEntity.Error()})
+	weakPassword   = toJSON(errorRes{users.ErrPasswordFormat.Error()})
 	unsupportedRes = toJSON(errorRes{api.ErrUnsupportedContentType.Error()})
 	failDecodeRes  = toJSON(errorRes{api.ErrFailedDecode.Error()})
 	groupExists    = toJSON(errorRes{users.ErrGroupConflict.Error()})
+	passRegex      = regexp.MustCompile("^.{8,}$")
 )
 
 type testRequest struct {
@@ -73,7 +79,7 @@ func newService() users.Service {
 	email := mocks.NewEmailer()
 	idProvider := uuid.New()
 
-	return users.New(usersRepo, groupRepo, hasher, auth, email, idProvider)
+	return users.New(usersRepo, groupRepo, hasher, auth, email, idProvider, passRegex)
 }
 
 func newServer(svc users.Service) *httptest.Server {
@@ -93,7 +99,8 @@ func TestRegister(t *testing.T) {
 	client := ts.Client()
 
 	data := toJSON(user)
-	invalidData := toJSON(users.User{Email: invalidEmail, Password: "password"})
+	invalidData := toJSON(users.User{Email: invalidEmail, Password: validPass})
+	invalidPasswordData := toJSON(users.User{Email: validEmail, Password: invalidPass})
 	invalidFieldData := fmt.Sprintf(`{"email": "%s", "pass": "%s"}`, user.Email, user.Password)
 
 	cases := []struct {
@@ -105,6 +112,7 @@ func TestRegister(t *testing.T) {
 		{"register new user", data, contentType, http.StatusCreated},
 		{"register existing user", data, contentType, http.StatusConflict},
 		{"register user with invalid email address", invalidData, contentType, http.StatusBadRequest},
+		{"register user with weak password", invalidPasswordData, contentType, http.StatusBadRequest},
 		{"register user with invalid request format", "{", contentType, http.StatusBadRequest},
 		{"register user with empty JSON request", "{}", contentType, http.StatusBadRequest},
 		{"register user with empty request", "", contentType, http.StatusBadRequest},
@@ -138,15 +146,15 @@ func TestLogin(t *testing.T) {
 	data := toJSON(user)
 	invalidEmailData := toJSON(users.User{
 		Email:    invalidEmail,
-		Password: "password",
+		Password: validPass,
 	})
 	invalidData := toJSON(users.User{
-		Email:    "user@example.com",
+		Email:    validEmail,
 		Password: "invalid_password",
 	})
 	nonexistentData := toJSON(users.User{
 		Email:    "non-existentuser@example.com",
-		Password: "password",
+		Password: validPass,
 	})
 	_, err := svc.Register(context.Background(), user)
 	require.Nil(t, err, fmt.Sprintf("register user got unexpected error: %s", err))
@@ -235,7 +243,7 @@ func TestPasswordResetRequest(t *testing.T) {
 
 	nonexistentData := toJSON(users.User{
 		Email:    "non-existentuser@example.com",
-		Password: "password",
+		Password: validPass,
 	})
 
 	expectedExisting := toJSON(struct {
@@ -322,9 +330,12 @@ func TestPasswordReset(t *testing.T) {
 
 	reqData.Token = token
 
-	reqData.ConfPass = "wrong"
+	reqData.ConfPass = invalidPass
 	reqPassNoMatch := toJSON(reqData)
 
+	reqData.Password = invalidPass
+	reqPassWeak := toJSON(reqData)
+
 	cases := []struct {
 		desc        string
 		req         string
@@ -340,6 +351,7 @@ func TestPasswordReset(t *testing.T) {
 		{"password reset request with empty JSON request", "{}", contentType, http.StatusBadRequest, malformedRes, token},
 		{"password reset request with empty request", "", contentType, http.StatusBadRequest, failDecodeRes, token},
 		{"password reset request with missing content type", reqExisting, "", http.StatusUnsupportedMediaType, unsupportedRes, token},
+		{"password reset with weak password", reqPassWeak, contentType, http.StatusBadRequest, weakPassword, token},
 	}
 
 	for _, tc := range cases {
@@ -395,9 +407,13 @@ func TestPasswordChange(t *testing.T) {
 
 	reqNoExist := toJSON(reqData)
 
-	reqData.OldPassw = "wrong"
+	reqData.OldPassw = invalidPass
 	reqWrongPass := toJSON(reqData)
 
+	reqData.OldPassw = user.Password
+	reqData.Password = invalidPass
+	reqWeakPass := toJSON(reqData)
+
 	resData.Msg = users.ErrUnauthorizedAccess.Error()
 
 	cases := []struct {
@@ -411,6 +427,7 @@ func TestPasswordChange(t *testing.T) {
 		{"password change with valid token", dataResExisting, contentType, http.StatusCreated, expectedSuccess, token},
 		{"password change with invalid token", reqNoExist, contentType, http.StatusForbidden, unauthRes, ""},
 		{"password change with invalid old password", reqWrongPass, contentType, http.StatusForbidden, unauthRes, token},
+		{"password change with invalid new password", reqWeakPass, contentType, http.StatusBadRequest, weakPassword, token},
 		{"password change with empty JSON request", "{}", contentType, http.StatusBadRequest, malformedRes, token},
 		{"password change empty request", "", contentType, http.StatusBadRequest, failDecodeRes, token},
 		{"password change missing content type", dataResExisting, "", http.StatusUnsupportedMediaType, unsupportedRes, token},
diff --git a/users/api/requests.go b/users/api/requests.go
index 280972f1..59ca18c1 100644
--- a/users/api/requests.go
+++ b/users/api/requests.go
@@ -8,7 +8,6 @@ import (
 )
 
 const (
-	minPassLen  = 8
 	maxNameSize = 1024
 )
 
@@ -100,11 +99,8 @@ func (req passwChangeReq) validate() error {
 	if req.Token == "" {
 		return users.ErrUnauthorizedAccess
 	}
-	if len(req.Password) < minPassLen {
-		return users.ErrMalformedEntity
-	}
 	if req.OldPassword == "" {
-		return users.ErrUnauthorizedAccess
+		return users.ErrMalformedEntity
 	}
 	return nil
 }
diff --git a/users/api/transport.go b/users/api/transport.go
index 086ee554..53acc6ed 100644
--- a/users/api/transport.go
+++ b/users/api/transport.go
@@ -432,6 +432,8 @@ func encodeError(_ context.Context, err error, w http.ResponseWriter) {
 			w.WriteHeader(http.StatusBadRequest)
 		case errors.Contains(errorVal, users.ErrRecoveryToken):
 			w.WriteHeader(http.StatusNotFound)
+		case errors.Contains(errorVal, users.ErrPasswordFormat):
+			w.WriteHeader(http.StatusBadRequest)
 		default:
 			w.WriteHeader(http.StatusInternalServerError)
 		}
diff --git a/users/service.go b/users/service.go
index 61c59b6d..dac7adfd 100644
--- a/users/service.go
+++ b/users/service.go
@@ -66,6 +66,9 @@ var (
 
 	// ErrAssignUserToGroup indicates an error in assigning user to a group.
 	ErrAssignUserToGroup = errors.New("failed assigning user to a group")
+
+	// ErrPasswordFormat indicates weak password.
+	ErrPasswordFormat = errors.New("password does not meet the requirements")
 )
 
 // Service specifies an API that must be fullfiled by the domain service
@@ -164,10 +167,11 @@ type usersService struct {
 	email      Emailer
 	auth       mainflux.AuthServiceClient
 	idProvider mainflux.IDProvider
+	passRegex  *regexp.Regexp
 }
 
 // New instantiates the users service implementation
-func New(users UserRepository, groups GroupRepository, hasher Hasher, auth mainflux.AuthServiceClient, m Emailer, idp mainflux.IDProvider) Service {
+func New(users UserRepository, groups GroupRepository, hasher Hasher, auth mainflux.AuthServiceClient, m Emailer, idp mainflux.IDProvider, passRegex *regexp.Regexp) Service {
 	return &usersService{
 		users:      users,
 		groups:     groups,
@@ -175,6 +179,7 @@ func New(users UserRepository, groups GroupRepository, hasher Hasher, auth mainf
 		auth:       auth,
 		email:      m,
 		idProvider: idp,
+		passRegex:  passRegex,
 	}
 }
 
@@ -182,6 +187,9 @@ func (svc usersService) Register(ctx context.Context, user User) (string, error)
 	if err := user.Validate(); err != nil {
 		return "", err
 	}
+	if !svc.passRegex.MatchString(user.Password) {
+		return "", ErrPasswordFormat
+	}
 	hash, err := svc.hasher.Hash(user.Password)
 	if err != nil {
 		return "", errors.Wrap(ErrMalformedEntity, err)
@@ -290,6 +298,9 @@ func (svc usersService) ResetPassword(ctx context.Context, resetToken, password
 	if err != nil || u.Email == "" {
 		return ErrUserNotFound
 	}
+	if !svc.passRegex.MatchString(password) {
+		return ErrPasswordFormat
+	}
 	password, err = svc.hasher.Hash(password)
 	if err != nil {
 		return err
@@ -302,6 +313,9 @@ func (svc usersService) ChangePassword(ctx context.Context, authToken, password,
 	if err != nil {
 		return errors.Wrap(ErrUnauthorizedAccess, err)
 	}
+	if !svc.passRegex.MatchString(password) {
+		return ErrPasswordFormat
+	}
 	u := User{
 		Email:    email,
 		Password: oldPassword,
diff --git a/users/service_test.go b/users/service_test.go
index c316db3d..93b2197e 100644
--- a/users/service_test.go
+++ b/users/service_test.go
@@ -6,6 +6,7 @@ package users_test
 import (
 	"context"
 	"fmt"
+	"regexp"
 	"testing"
 
 	"github.com/mainflux/mainflux"
@@ -27,6 +28,7 @@ var (
 	groupName       = "Mainflux"
 
 	idProvider = uuid.New()
+	passRegex  = regexp.MustCompile("^.{8,}$")
 )
 
 func newService() users.Service {
@@ -36,7 +38,7 @@ func newService() users.Service {
 	auth := mocks.NewAuthService(map[string]string{user.Email: user.Email})
 	e := mocks.NewEmailer()
 
-	return users.New(userRepo, groupRepo, hasher, auth, e, idProvider)
+	return users.New(userRepo, groupRepo, hasher, auth, e, idProvider, passRegex)
 }
 
 func TestRegister(t *testing.T) {
@@ -58,12 +60,12 @@ func TestRegister(t *testing.T) {
 			err:  users.ErrConflict,
 		},
 		{
-			desc: "register new user with empty password",
+			desc: "register new user with weak password",
 			user: users.User{
 				Email:    user.Email,
-				Password: "",
+				Password: "weak",
 			},
-			err: users.ErrMalformedEntity,
+			err: users.ErrPasswordFormat,
 		},
 	}
 
diff --git a/users/users.go b/users/users.go
index 7b90ace7..d7dedd94 100644
--- a/users/users.go
+++ b/users/users.go
@@ -13,7 +13,6 @@ import (
 )
 
 const (
-	minPassLen   = 8
 	maxLocalLen  = 64
 	maxDomainLen = 255
 	maxTLDLen    = 24 // longest TLD currently in existence
@@ -46,11 +45,6 @@ func (u User) Validate() error {
 	if !isEmail(u.Email) {
 		return ErrMalformedEntity
 	}
-
-	if len(u.Password) < minPassLen {
-		return ErrMalformedEntity
-	}
-
 	return nil
 }
 
diff --git a/users/users_test.go b/users/users_test.go
index 5da4e3fc..b777f6aa 100644
--- a/users/users_test.go
+++ b/users/users_test.go
@@ -72,13 +72,6 @@ func TestValidate(t *testing.T) {
 			},
 			err: users.ErrMalformedEntity,
 		},
-		"validate user with empty password": {
-			user: users.User{
-				Email:    email,
-				Password: "",
-			},
-			err: users.ErrMalformedEntity,
-		},
 		"validate user with invalid email": {
 			user: users.User{
 				Email:    "userexample.com",