refactor: re-implement logic of notify

internal/pkg/core/notifier/providers/email/email.go

@@ -2,10 +2,10 @@
 
 import (
 	"context"
+	"crypto/tls"
 	"errors"
 	"fmt"
 	"net/smtp"
-	"os"
 
 	"github.com/domodwyer/mailyak/v3"
 
@@ -44,15 +44,25 @@ func (n *EmailNotifier) Notify(ctx context.Context, subject string, message stri
 		smtpAuth = smtp.PlainAuth("", n.config.Username, n.config.Password, n.config.SmtpHost)
 	}
 
+	var smtpAddr string
+	if n.config.SmtpPort == 0 {
+		if n.config.SmtpTLS {
+			smtpAddr = fmt.Sprintf("%s:465", n.config.SmtpHost)
+		} else {
+			smtpAddr = fmt.Sprintf("%s:25", n.config.SmtpHost)
+		}
+	} else {
+		smtpAddr = fmt.Sprintf("%s:%d", n.config.SmtpHost, n.config.SmtpPort)
+	}
+
 	var yak *mailyak.MailYak
 	if n.config.SmtpTLS {
-		os.Setenv("GODEBUG", "tlsrsakex=1") // Fix for TLS handshake error
-		yak, err = mailyak.NewWithTLS(fmt.Sprintf("%s:%d", n.config.SmtpHost, n.config.SmtpPort), smtpAuth, nil)
+		yak, err = mailyak.NewWithTLS(smtpAddr, smtpAuth, newTlsConfig())
 		if err != nil {
 			return nil, err
 		}
 	} else {
-		yak = mailyak.New(fmt.Sprintf("%s:%d", n.config.SmtpHost, n.config.SmtpPort), smtpAuth)
+		yak = mailyak.New(smtpAddr, smtpAuth)
 	}
 
 	yak.From(n.config.SenderAddress)
@@ -67,3 +77,19 @@ func (n *EmailNotifier) Notify(ctx context.Context, subject string, message stri
 
 	return &notifier.NotifyResult{}, nil
 }
+
+func newTlsConfig() *tls.Config {
+	var suiteIds []uint16
+	for _, suite := range tls.CipherSuites() {
+		suiteIds = append(suiteIds, suite.ID)
+	}
+	for _, suite := range tls.InsecureCipherSuites() {
+		suiteIds = append(suiteIds, suite.ID)
+	}
+
+	// 为兼容国内部分低版本 TLS 的 SMTP 服务商
+	return &tls.Config{
+		MinVersion:   tls.VersionTLS10,
+		CipherSuites: suiteIds,
+	}
+}