diff --git a/server/go.mod b/server/go.mod
index ffe9c9e..4673256 100644
--- a/server/go.mod
+++ b/server/go.mod
@@ -19,6 +19,7 @@ require (
 	golang.org/x/crypto v0.22.0
 	golang.org/x/text v0.14.0
 	modernc.org/sqlite v1.29.6
+	xorm.io/builder v0.3.13
 	xorm.io/xorm v1.3.9
 )
 
@@ -50,5 +51,4 @@ require (
 	modernc.org/memory v1.8.0 // indirect
 	modernc.org/strutil v1.2.0 // indirect
 	modernc.org/token v1.1.0 // indirect
-	xorm.io/builder v0.3.13 // indirect
 )
diff --git a/server/services/setup/dns.go b/server/services/setup/dns.go
index f3cd6e2..78fa882 100644
--- a/server/services/setup/dns.go
+++ b/server/services/setup/dns.go
@@ -26,6 +26,7 @@ func GetDNSSettings(ctx *context.Context) ([]*DNSItem, error) {
 	ret := []*DNSItem{
 		{Type: "A", Host: "smtp", Value: ip.GetIp(), TTL: 3600, Tips: i18n.GetText(ctx.Lang, "ip_taps")},
 		{Type: "A", Host: "pop", Value: ip.GetIp(), TTL: 3600, Tips: i18n.GetText(ctx.Lang, "ip_taps")},
+		{Type: "A", Host: "-", Value: ip.GetIp(), TTL: 3600, Tips: i18n.GetText(ctx.Lang, "ip_taps")},
 		{Type: "MX", Host: "-", Value: fmt.Sprintf("smtp.%s", configData.Domain), TTL: 3600},
 		{Type: "TXT", Host: "-", Value: "v=spf1 a mx ~all", TTL: 3600},
 		{Type: "TXT", Host: "default._domainkey", Value: auth.DkimGen(), TTL: 3600},
diff --git a/server/utils/send/send.go b/server/utils/send/send.go
index 678101c..ee156d0 100644
--- a/server/utils/send/send.go
+++ b/server/utils/send/send.go
@@ -174,7 +174,8 @@ func Send(ctx *context.Context, e *parsemail.Email) (error, map[string]error) {
 
 			// 使用其他方式发送
 			if err != nil {
-				if errors.Is(err, smtp.NoSupportSTARTTLSError) {
+				// EOF 表示未知错误，此时降级为非tls连接发送（目前仅139邮箱有这个问题）
+				if errors.Is(err, smtp.NoSupportSTARTTLSError) || err.Error() == "EOF" {
 					err = smtp.SendMailWithTls("", domain.mxHost+":465", nil, e.From.EmailAddress, buildAddress(tos), b)
 					if err != nil {
 						log.WithContext(ctx).Warnf("Unsafe! %s Server Not Support SMTPS & STARTTLS", domain.domain)
diff --git a/server/utils/smtp/smtp.go b/server/utils/smtp/smtp.go
index b248097..36a9a6d 100644
--- a/server/utils/smtp/smtp.go
+++ b/server/utils/smtp/smtp.go
@@ -34,6 +34,7 @@ import (
 )
 
 var NoSupportSTARTTLSError = errors.New("smtp: server doesn't support STARTTLS")
+var EOFError = errors.New("EOF")
 
 // A Client represents a client connection to an SMTP server.
 type Client struct {