我想制作自己的邮件服务器。 因此，我使用了MailEnable，它是一个邮件服务器程序。 我发现该程序不允许通过端口25进行SMTP，并且 我将SMTP端口更改为443。还有防火墙配置。 我检查了telnet服务是否正确打开了端口以及DNS的MX记录。 邮件服务器程序和客户端程序（Thunderbird）已成功连接，但是我发送的邮件无法到达目的地。 它反复被延迟，最终失败。 我从邮件服务器程序中获得了DEBUG文件。 任何人都有一个想法如何解决。 分享一些想法！
10/07/18 06:27:19 ME-I0135: Authenticated User:myUser using Authentication Provider Credentials
10/07/18 06:27:19 ME-I0107: [832] Relay Granted: Sender IP (52.231.xx.xx) is within an authorized IP range.
10/07/18 06:27:19 ME-I0149: [832] 1907CF9B52BB4EB09AA671C946D16FF7.MAI was received successfully and delivery thread was initiated
10/07/18 06:27:19 ME-I0074: [832] (Debug) End of conversation
10/07/18 06:27:20 ME-I0018: [71FFAE47358542CDB7BB0C7524C5EBC9.MAI] Outbound message from ([SMTP:wschoi@dnjstjr.site]) requeued as [E4AF8601180E47CC823CD8C14FD95A9C.MAI] to the target domain [naver.com]
10/07/18 06:27:20 ME-I0123: Domain [naver.com] has MX list [mx1.naver.com,mx2.naver.com,mx3.naver.com]
10/07/18 06:27:20 ME-I0026: [E4AF8601180E47CC823CD8C14FD95A9C.MAI] Sending message
10/07/18 06:27:20 ME-IXXXX: [E4AF8601180E47CC823CD8C14FD95A9C.MAI] DNS resolved to the following record: IP Address=125.209.238.100, Family=2, Type=1, Protocol=6
10/07/18 06:27:41 ME-E0038: [E4AF8601180E47CC823CD8C14FD95A9C.MAI] Communications Error: Socket connection to mx1.naver.com failed (error 10060). The host was either not contactable or it rejected your connection. Socket Family = 2; Host=125.209.238.100; Port=25
10/07/18 06:27:41 ME-I1350: [E4AF8601180E47CC823CD8C14FD95A9C.MAI] Attempting to connect to MX 2 of 3 (mx2.naver.com ).
10/07/18 06:27:41 ME-IXXXX: [E4AF8601180E47CC823CD8C14FD95A9C.MAI] DNS resolved to the following record: IP Address=125.209.238.137, Family=2, Type=1, Protocol=6
10/07/18 06:28:02 ME-E0038: [E4AF8601180E47CC823CD8C14FD95A9C.MAI] Communications Error: Socket connection to mx2.naver.com failed (error 10060). The host was either not contactable or it rejected your connection. Socket Family = 2; Host=125.209.238.137; Port=25
10/07/18 06:28:02 ME-I1350: [E4AF8601180E47CC823CD8C14FD95A9C.MAI] Attempting to connect to MX 3 of 3 (mx3.naver.com ).
10/07/18 06:28:02 ME-IXXXX: [E4AF8601180E47CC823CD8C14FD95A9C.MAI] DNS resolved to the following record: IP Address=125.209.222.14, Family=2, Type=1, Protocol=6
10/07/18 06:28:23 ME-E0038: [E4AF8601180E47CC823CD8C14FD95A9C.MAI] Communications Error: Socket connection to mx3.naver.com failed (error 10060). The host was either not contactable or it rejected your connection. Socket Family = 2; Host=125.209.222.14; Port=25
10/07/18 06:28:23 ME-E0059: [E4AF8601180E47CC823CD8C14FD95A9C.MAI] Message Delivery Failure. Attempt (0): Could not connect to mail server for domain (naver.com ). The remote mail server could not be contacted at this time. Message has been requeued.