diff --git a/.golangci.yaml b/.golangci.yaml
new file mode 100644
index 0000000..5518484
--- /dev/null
+++ b/.golangci.yaml
@@ -0,0 +1,140 @@
+run:
+  timeout: 3m
+  # Exit code when at least one issue was found.
+  # Default: 1
+  issues-exit-code: 2
+  # Include test files or not.
+  # Default: true
+  tests: false
+
+# Reference URL: https://golangci-lint.run/usage/linters/
+linters:
+  # Disable everything by default so upgrades to not include new - default
+  # enabled-  linters.
+  disable-all: true
+  # Specifically enable linters we want to use.
+  enable:
+    #    - depguard
+    - errcheck
+    #    - godot
+    - gofmt
+    - goimports
+    - gosimple
+    - govet
+    - ineffassign
+    - misspell
+    - revive
+    #    - staticcheck
+    - typecheck
+    - unused
+    #    - wsl
+    - asasalint
+    - asciicheck
+    - bidichk
+    - bodyclose
+    #    - containedctx
+    - contextcheck
+    #    - cyclop
+    #    - varnamelen
+    # - gci
+    - wastedassign
+    - whitespace
+    #    - wrapcheck
+    - thelper
+    - tparallel
+    - unconvert
+    - unparam
+    - usestdlibvars
+    - tenv
+    - testableexamples
+    - stylecheck
+    - sqlclosecheck
+    - nosprintfhostport
+    - paralleltest
+    - prealloc
+    - predeclared
+    - promlinter
+    - reassign
+    - rowserrcheck
+    - nakedret
+    - nestif
+    - nilerr
+    - nilnil
+    - nlreturn
+    - noctx
+    - nolintlint
+    - nonamedreturns
+    - decorder
+    - dogsled
+    #    - dupl
+    - dupword
+    - durationcheck
+    - errchkjson
+    - errname
+    - errorlint
+    # - execinquery
+    - exhaustive
+    - exportloopref
+    - forbidigo
+    - forcetypeassert
+    #    - gochecknoglobals
+    - gochecknoinits
+    - gocognit
+    - goconst
+    - gocritic
+    - gocyclo
+    #   - godox
+    #   - goerr113
+    #   - gofumpt
+    - goheader
+    - gomoddirectives
+    #    - gomodguard always failed
+    - goprintffuncname
+    - gosec
+    - grouper
+    - importas
+    - interfacebloat
+    #    - ireturn
+    - lll
+    - loggercheck
+    - maintidx
+    - makezero
+
+issues:
+  exclude-rules:
+    - path: _test\.go
+      linters:
+        - funlen
+        - goconst
+        - interfacer
+        - dupl
+        - lll
+        - goerr113
+        - errcheck
+        - gocritic
+        - cyclop
+        - wrapcheck
+        - gocognit
+        - contextcheck
+
+linters-settings:
+  gci:
+    sections:
+      - standard # Standard section: captures all standard packages.
+      - default # Default section: contains all imports that could not be matched to another section type.
+  gocognit:
+    # Minimal code complexity to report.
+    # Default: 30 (but we recommend 10-20)
+    min-complexity: 40
+  nestif:
+    # Minimal complexity of if statements to report.
+    # Default: 5
+    min-complexity: 10
+  lll:
+    # Max line length, lines longer will be reported.
+    # '\t' is counted as 1 character by default, and can be changed with the tab-width option.
+    # Default: 120.
+    line-length: 200
+    # Tab width in spaces.
+    # Default: 1
+    tab-width: 1
diff --git a/etc/service.yaml b/etc/service.yaml
index f9a189a..319ba6f 100644
--- a/etc/service.yaml
+++ b/etc/service.yaml
@@ -4,3 +4,13 @@ Etcd:
   Hosts:
   - 127.0.0.1:2379
   Key: service.rpc
+SMTP:
+  Host: smtp.mailgun.org
+  Port: 25
+  User: postmaster@code.30cm.net
+  Password: 9015592e10f385e4f16705e00a5e0d3d-2b91eb47-31205b4e
+
+SMSSender:
+  User: daniel@30cm.net
+  Password : test123
+
diff --git a/go.mod b/go.mod
index eee482d..f983540 100644
--- a/go.mod
+++ b/go.mod
@@ -5,6 +5,7 @@ go 1.22.3
 require (
 	code.30cm.net/digimon/library-go/errors v1.0.0
 	code.30cm.net/digimon/library-go/validator v1.0.0
+	code.30cm.net/digimon/library-go/worker_pool v0.0.0-20240820153352-f9c90a90f5e2
 	github.com/minchao/go-mitake v1.0.0
 	github.com/zeromicro/go-zero v1.7.0
 	google.golang.org/grpc v1.65.0
@@ -49,6 +50,7 @@ require (
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/openzipkin/zipkin-go v0.4.3 // indirect
+	github.com/panjf2000/ants/v2 v2.10.0 // indirect
 	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
 	github.com/prometheus/client_golang v1.19.1 // indirect
 	github.com/prometheus/client_model v0.5.0 // indirect
@@ -77,6 +79,7 @@ require (
 	golang.org/x/crypto v0.25.0 // indirect
 	golang.org/x/net v0.27.0 // indirect
 	golang.org/x/oauth2 v0.20.0 // indirect
+	golang.org/x/sync v0.7.0 // indirect
 	golang.org/x/sys v0.22.0 // indirect
 	golang.org/x/term v0.22.0 // indirect
 	golang.org/x/text v0.16.0 // indirect
diff --git a/internal/logic/senderservice/send_mail_by_template_id_logic.go b/internal/logic/senderservice/send_mail_by_template_id_logic.go
index abf4b49..b9decc9 100644
--- a/internal/logic/senderservice/send_mail_by_template_id_logic.go
+++ b/internal/logic/senderservice/send_mail_by_template_id_logic.go
@@ -3,9 +3,10 @@ package senderservicelogic
 import (
 	"app-cloudep-notification-service/gen_result/pb/notification"
 	"app-cloudep-notification-service/internal/svc"
-	ers "code.30cm.net/digimon/library-go/errors"
 	"context"
 	"fmt"
+
+	ers "code.30cm.net/digimon/library-go/errors"
 	"github.com/zeromicro/go-zero/core/logx"
 )
 
diff --git a/internal/logic/senderservice/send_mail_logic.go b/internal/logic/senderservice/send_mail_logic.go
index 39ad124..c7aa930 100644
--- a/internal/logic/senderservice/send_mail_logic.go
+++ b/internal/logic/senderservice/send_mail_logic.go
@@ -2,9 +2,10 @@ package senderservicelogic
 
 import (
 	"app-cloudep-notification-service/internal/domain/usecase"
-	ers "code.30cm.net/digimon/library-go/errors"
 	"context"
 
+	ers "code.30cm.net/digimon/library-go/errors"
+
 	"app-cloudep-notification-service/gen_result/pb/notification"
 	"app-cloudep-notification-service/internal/svc"
 
@@ -47,6 +48,7 @@ func (l *SendMailLogic) SendMail(in *notification.SendMailReq) (*notification.OK
 		return nil, ers.InvalidFormat(err.Error())
 	}
 
+	// TODO 以後可以做換線
 	err := l.svcCtx.MailSender.SendMail(l.ctx, usecase.MailReq{
 		To:      in.GetTo(),
 		Subject: in.GetSubject(),
diff --git a/internal/logic/senderservice/send_sms_logic.go b/internal/logic/senderservice/send_sms_logic.go
index 152d890..83d79fa 100644
--- a/internal/logic/senderservice/send_sms_logic.go
+++ b/internal/logic/senderservice/send_sms_logic.go
@@ -2,9 +2,10 @@ package senderservicelogic
 
 import (
 	"app-cloudep-notification-service/internal/domain/usecase"
-	ers "code.30cm.net/digimon/library-go/errors"
 	"context"
 
+	ers "code.30cm.net/digimon/library-go/errors"
+
 	"app-cloudep-notification-service/gen_result/pb/notification"
 	"app-cloudep-notification-service/internal/svc"
 
@@ -44,6 +45,7 @@ func (l *SendSmsLogic) SendSms(in *notification.SendSMSReq) (*notification.OKRes
 		return nil, ers.InvalidFormat(err.Error())
 	}
 
+	// TODO 以後可以做換線
 	err := l.svcCtx.SMSSender.SendSMS(l.ctx, usecase.SMSReq{
 		RecipientAddress: in.GetTo(),
 		RecipientName:    in.GetRecipientName(),
diff --git a/internal/server/senderservice/sender_service_server.go b/internal/server/senderservice/sender_service_server.go
index 7300421..99f6d32 100644
--- a/internal/server/senderservice/sender_service_server.go
+++ b/internal/server/senderservice/sender_service_server.go
@@ -7,7 +7,7 @@ import (
 	"context"
 
 	"app-cloudep-notification-service/gen_result/pb/notification"
-	"app-cloudep-notification-service/internal/logic/senderservice"
+	senderservicelogic "app-cloudep-notification-service/internal/logic/senderservice"
 	"app-cloudep-notification-service/internal/svc"
 )
 
diff --git a/internal/svc/service_context.go b/internal/svc/service_context.go
index 09a29c1..7ce53b9 100644
--- a/internal/svc/service_context.go
+++ b/internal/svc/service_context.go
@@ -4,6 +4,7 @@ import (
 	"app-cloudep-notification-service/internal/config"
 	domainUC "app-cloudep-notification-service/internal/domain/usecase"
 	"app-cloudep-notification-service/internal/usecase"
+
 	v "code.30cm.net/digimon/library-go/validator"
 )
 
diff --git a/internal/usecase/mitake.go b/internal/usecase/mitake.go
index cd8e622..ac332bc 100644
--- a/internal/usecase/mitake.go
+++ b/internal/usecase/mitake.go
@@ -4,6 +4,7 @@ import (
 	"app-cloudep-notification-service/internal/config"
 	"app-cloudep-notification-service/internal/domain/usecase"
 	"context"
+
 	"github.com/minchao/go-mitake"
 )
 
diff --git a/internal/usecase/smtp.go b/internal/usecase/smtp.go
index 9a10771..f4d97e7 100644
--- a/internal/usecase/smtp.go
+++ b/internal/usecase/smtp.go
@@ -3,7 +3,12 @@ package usecase
 import (
 	"app-cloudep-notification-service/internal/config"
 	"app-cloudep-notification-service/internal/domain/usecase"
+
+	pool "code.30cm.net/digimon/library-go/worker_pool"
+	"github.com/zeromicro/go-zero/core/logx"
+
 	"context"
+
 	"gopkg.in/gomail.v2"
 )
 
@@ -16,19 +21,28 @@ type MailUseCase struct {
 	Port     int
 	User     string
 	Password string
+	Pool     pool.WorkerPool
 }
 
 func (mu *MailUseCase) SendMail(_ context.Context, req usecase.MailReq) error {
-	m := gomail.NewMessage()
-	m.SetHeader("From", req.From)
-	m.SetHeader("To", req.To)
-	m.SetHeader("Subject", req.Subject)
-	m.SetBody("text/html", req.Body)
-	d := gomail.NewDialer(mu.Host, mu.Port, mu.User, mu.Password)
-	if err := d.DialAndSend(m); err != nil {
-		return err
-	}
-	return nil
+	// 用 goroutine pool 送，否則會超時
+	err := mu.Pool.Submit(func() {
+		m := gomail.NewMessage()
+		m.SetHeader("From", req.From)
+		m.SetHeader("To", req.To)
+		m.SetHeader("Subject", req.Subject)
+		m.SetBody("text/html", req.Body)
+		d := gomail.NewDialer(mu.Host, mu.Port, mu.User, mu.Password)
+		if err := d.DialAndSend(m); err != nil {
+			logx.WithCallerSkip(1).WithFields(
+				logx.Field("func", "MailUseCase.SendMail"),
+				logx.Field("req", req),
+				logx.Field("err", err),
+			).Error("failed to send mail by mailgun")
+		}
+	})
+
+	return err
 }
 
 func MustMailgunUseCase(param MailUseCaseParam) usecase.MailClientUseCase {
@@ -37,5 +51,6 @@ func MustMailgunUseCase(param MailUseCaseParam) usecase.MailClientUseCase {
 		Port:     param.Conf.SMTP.Port,
 		User:     param.Conf.SMTP.User,
 		Password: param.Conf.SMTP.Password,
+		Pool:     pool.NewWorkerPool(2000),
 	}
 }