Mailpit(開源 SMTP 模擬服務)
- 因為要驗證應用系統寄信的狀況, 透過實際 Mail Server 雖然也可以驗證, 但效率比較差也常發現收不到信是被中間的一些 SPAM 的機制攔截, 因此有不少開源 SMTP 模擬服務專案出現
安裝方式
docker-compose.yml
services: mailpit: image: axllent/mailpit container_name: mailpit ports: - "1025:1025" # SMTP - "8025:8025" # Web environment: - MP_SMTP_TLS_CERT=/etc/mailpit/ServerCA.crt - MP_SMTP_TLS_KEY=/etc/mailpit/ServerCA.key - MP_SMTP_AUTH_ACCEPT_ANY=true - MP_SMTP_REQUIRE_STARTTLS=true # STARTTLS - MP_SMTP_REQUIRE_TLS=false # SSL/TLS - MP_UI_LANG=zh_TW - MP_UI_AUTO_REFRESH=10 volumes: - ./certs:/etc/mailpit restart: unless-stoppedhttps://raw.githubusercontent.com/tryweb/docker-compose/refs/heads/main/mailpit/docker-compose.yml
- 參考 OpenSSL 簽發憑證方式 來產生SSL憑證
- 將產生的 ServerCA.cer 與 ServerCA.key 放入 certs 目錄內
- 啟動 docker compose 即可提供 SMTP 服務
測試方式
- 環境變數 MP_SMTP_REQUIRE_STARTTLS=true 表示設定為 STARTTLS, 測試方式
openssl s_client -connect localhost:1025 -starttls smtp - 環境變數 MP_SMTP_REQUIRE_TLS=true 表示設定為 SSL/TLS, 測試方式
openssl s_client -connect localhost:1025 - 正確回應的結果應該可以看到憑證的內容 Exp.
$ openssl s_client -connect localhost:1025 -starttls smtp CONNECTED(00000003) Can't use SSL_get_servername depth=0 C = TW, ST = Taiwan, L = Taipei, O = III, OU = DevOps, CN = MailHog, emailAddress = [email protected] verify error:num=20:unable to get local issuer certificate verify return:1 depth=0 C = TW, ST = Taiwan, L = Taipei, O = III, OU = DevOps, CN = MailHog, emailAddress = [email protected] verify error:num=21:unable to verify the first certificate verify return:1 depth=0 C = TW, ST = Taiwan, L = Taipei, O = III, OU = DevOps, CN = MailHog, emailAddress = [email protected] verify return:1 --- Certificate chain 0 s:C = TW, ST = Taiwan, L = Taipei, O = III, OU = DevOps, CN = MailHog, emailAddress = [email protected] i:C = TW, ST = Taiwan, L = Taipei, O = III, OU = DevOps, CN = Jonathan Tsai, emailAddress = [email protected] a:PKEY: rsaEncryption, 2048 (bit); sigalg: RSA-SHA1 v:NotBefore: Apr 12 02:31:31 2025 GMT; NotAfter: Apr 12 02:31:31 2027 GMT --- Server certificate -----BEGIN CERTIFICATE----- MIIDmjCCAoICFBr9dfIlHO4wEY7hxz/BJNhTuageMA0GCSqGSIb3DQEBBQUAMIGK MQswCQYDVQQGEwJUVzEPMA0GA1UECAwGVGFpd2FuMQ8wDQYDVQQHDAZUYWlwZWkx :
