From 2a3e8f844f8ba3209169d7ac375425c18ce3afd0 Mon Sep 17 00:00:00 2001
From: jinnrry <19919556+Jinnrry@users.noreply.github.com>
Date: Sat, 25 May 2024 23:15:39 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E5=A4=8D139=E9=82=AE=E7=AE=B1?=
 =?UTF-8?q?=E5=8F=91=E4=BB=B6=E9=94=99=E8=AF=AF?=
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---
 server/go.mod             | 2 +-
 server/utils/send/send.go | 3 ++-
 server/utils/smtp/smtp.go | 1 +
 3 files changed, 4 insertions(+), 2 deletions(-)

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/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 {