21、
      <[email protected]>: host
          jnj1-1588-mail1.customer.global.sprint.com[148.177.2.24] said: 554
      5.7.1
          This site does not accept .wmz attachments (in reply to end of DATA
          command)
      退信問題是因為對方的伺服器不接受.wmz的附件，可以試下把附件壓縮成RAR或ZIP的檔案再發送。
      22、
      發件人：[email protected]

      收件人：[email protected]
      Final-Recipient: rfc822; [email protected]
      Action: failed
      Status: 5.0.0
      Diagnostic-Code: X-Postfix; host mxmta.bellnexxia.net[209.226.175.245]
      said: 554 #5.3.0 Server Error (in reply to end of DATA command)
      對方伺服器在處理郵件資料的時候發生錯誤，被退信。
      23、
      有兩種情況.一種是發信時OUTLOOK的SMTP身份驗證沒有打勾.一種是發信時SMTP的IP不是我們郵局的IP.
      The SMTP Server program
      <

[email protected]>: host mail.tiansheng.com[218.107.207.80] said: 553
      <[email protected]>: Sender address rejected: not logged in (in reply to
      MAIL FROM command)
      24、
      ([email protected]>: Host or domain name not found. Name service
      error for name=mail.ezam-ipmc.com type=A: Host found but no data record of
      requested type
      這是在發信時.一時無法解析到對方的域名導致. 再讓客戶重發一遍即可
      25、
      <

[email protected]>: message size 2397844 exceeds size limit 2097152
      of server simapajouh.com[207.176.216.198]
      提示您傳送的郵件過大
      26、
      <[email protected]>: Host or domain name not found. Name service
      error for
      name=interfonos.com.mx type=A: Host found but no data record of requested
      type
     
      這封退信是因為您在發信時我司郵局伺服器無法正常解析到tadair.com.hk這個域名的郵局伺服器IP，或者有可能是因為對方 tadair.com.hk所使用的ＤＮＳ伺服器反應慢原因造成的，此種情況有時會造成郵件傳送不了，如果郵件沒有發出去只要重新發送一次即可，
        
出現這種錯誤是由於網路環境原因導致查詢不到IP，偶爾都會有的，特別是一些域名是通過國外DNS進行解析。是很常見的，因為網路牽涉到的東西太多了。
     
      27、
      <[email protected]>: host sbcmx1.prodigy.net[207.115.57.15] said: 553
      5.3.0
      ylpvm07,DNSBL:To request removal of, 61.152.144.250, send the complete
      error message in an E-mail to [email protected] (in reply to MAIL
      FROM command)
      提示您傳送的郵件有問題被移除
      28、
      <[email protected]>: host mxcanada.ipapp.com[216.152.192.202] said: 550
      Command RCPT User <[email protected]> not OK (in reply to RCPT TO
      command)
      郵箱[email protected]有問題。具體請諮詢該伺服器網管
      29、
      ([email protected]>: host mx5.pacific.net.sg[203.120.90.25] said:
      554 qq Sorry, no valid recipients (#5.1.3) (in reply to end of DATA
      command)
      不是有效的收件人,請客戶檢視下接收者地址是否正確?
      30、
      MX-record resolution of [hidistribuiton.co.uk] in progress (DNS Server:
      202.96.104.16)...
      Name server reports domain name unknown.
      Attempting SMTP connection to [hidistribuiton.co.uk : 25]
      A-record resolution of [hidistribuiton.co.uk] in progress (DNS Server:
      202.96.104.16)...
      Name server reports domain name unknown.
      可以判斷是因為接收方郵局的mx沒有做或者做錯，另外也有可能是接收方郵局DNS設定錯誤造成的。
      31、
      The Postfix program
      <[email protected]>: host sbcmx6.prodigy.net[207.115.57.18] said: 553
      5.3.0 ylpvm47,DNSBL:To request removal of, 61.152.144.250, send the
      complete error message in an E-mail to [email protected] (in
      reply to MAIL FROM command)
      這是IP61.152.144.250被DNSBL封了.需要聯絡解封.
      32、
       <[email protected]>: host mx.mail.126.com[220.181.31.188] said: 554
      sender is rejected: 0. (in reply to MAIL FROM command)
      這是126封了我們郵局
      33、
      從這個退信來看。是因為郵件內容有問題被對方伺服器拒絕收信。估計對方伺服器可能做了關鍵字過濾。
       The Postfix program
      ([email protected]>: host 127.0.0.1[127.0.0.1] said: 550 5.7.1
      Message content rejected, UBE, id=25443-10 (in reply to end of DATA
      command)
      34、
      這是對方拒絕我司郵局 。
      <[email protected]>: host mx01.263xmail.com[211.150.100.33] said:
      554
      <[email protected]>: Sender address rejected: Access denied (in reply to
      RCPT TO command)
      35、
      這是對方伺服器返回退信，是對方問題，提示對方伺服器收到郵件後不能轉給它下面的使用者：[email protected]
      The Postfix program
      ([email protected]>: host nolan-mfg.com[207.176.216.196] said: 550 5.7.1
      Unable to relay for [email protected] (in reply to RCPT TO command)
      36、
      連線此spam.crysp.co.za此伺服器超時，可重發看看。
          <[email protected]>: conversation with
      spam.crysp.co.za[196.14.176.4] timed out while sending message body
      37、
      The Postfix program
      <[email protected]>: Host or domain name not found. Name service error for
      name=home.com type=A: Host found but no data record of requested type
      對方的MX記錄的主機有找到，但對方沒有郵件服務。有可能對方的伺服器或者網路當時
      有問題。
      38、
      <[email protected]>: permission denied. Command output: maildrop:
          maildir over quota. maildrop: maildir over quota.
      接收方信箱已經滿或者是傳送方傳送的郵件大小超出對方的接收郵件限額
      39、
      <[email protected]>: message size 2811968 exceeds size limit 2097152
      of
          server fatihguvenlik.com[212.175.237.26]
      使用者傳送的郵件大小超出對方的接收郵件限額.
      40、
      The Postfix program
      <[email protected]>: host mx3.hotmail.com[65.54.253.99] said: 550
      Requested action not taken: mailbox unavailable (in reply to RCPT TO
      command)
      <[email protected]>: host modusgate3.thebiz.net[206.72.209.49] said: 550
      5.1.1    <[email protected]> is not a valid mailbox (in reply to RCPT TO
      command)
      使用者不存在
41、
      The Postfix program
      <[email protected]>: host mail.optusnet.com.au[211.29.132.250]
      said:553 5.3.0 <[email protected]>... No such user (in reply to RCPT
      TO command)
      一樣,不存在這個使用者,看其地址寫正確沒?
      42、
      The Postfix program
      <[email protected]>: hostmail.promoplace.com[208.215.218.14]
      said: 550 <[email protected]>, Recipient unknown (in reply to
      RCPT TO command)
      接收地址錯誤或不存在
      43、
      The Postfix program
      <[email protected]>: host mx03.alltel.net[166.102.165.23] said: 550
      Invalid
      recipient: <[email protected]> (in reply to RCPT TO command)
      無效的收信人
      44、
      The WorldPost program
      <[email protected]>: host
      inbound.registeredsite.com[64.224.219.122] said: 554 5.7.1 The message
      from (<[email protected]>) with the subject of (Fw: comments) matches
      a profile the Internet community may consider spam. Please revise your
      message before resending.
      這個退信也是對方認為：您傳送郵件的標題帶有：Fw: comments　字眼，而對方被過濾了
      45、
      退信是對方伺服器返回的，其認為客戶所發郵件帶有SPAM內容被拒。
      The Postfix program
      <[email protected]> (expanded from <[email protected]'" target="_blank">"hw:ventas"@commaxdvr.com>): host
      mail3.neureal.com[67.15.20.51] said: 552 sorry, the spam message is
      detected (#5.6.0) (in reply to end of DATA command)
      46、
      The Postfix program
      <[email protected]>: connect to sohumx.sohu.com[61.135.132.100]:
      server refused mail service
      Reporting-MTA: dns; mail.mail155.cn4e.com
      X-Postfix-Queue-ID: BC709131434
      X-Postfix-Sender: rfc822; [email protected]
      Arrival-Date: Thu, 24 Nov 2005 09:00:06 +0800 (CST)
      Final-Recipient: rfc822; [email protected]
      Action: failed
      Status: 4.0.0
      Diagnostic-Code: X-Postfix; connect to sohumx.sohu.com[61.135.132.100]:
      server refused mail service
      搜狐封我司郵局IP
      47、
      基本上是網路問題，導致在發郵件時丟失連線。
      The Postfix program
      <[email protected]>: lost connection with
      paladin2.mt.net.mk[195.26.152.152] while sending end of data -- message
      may be sent more than once
      48、
      對方認為客戶所發郵件內容含有他們所認為的SPAM資訊，所以拒絕。請重發一些內容簡單的郵件過去先測試一下。
      <[email protected]>: host avgate1.virusblocker.net[203.208.227.118]
      said: 554 Sorry, message looks like SPAM to me (in reply to end of DATA
      command)
      49、
      接收方要求郵局伺服器要反向解析。
      The Postfix program
      < [email protected]> : host mailin-03.mx.aol.com[64.12.138.57] said:
421-:
      (DNS:NR) http://postmaster.info.aol.com/errors/421dnsnr.html421SERVICE
      NOT AVAILABLE (in reply to end of DATA command)
      50、
      對方認為我們的IP是偽造，這是對方的設定問題，請對方把我們的IP或此域名加入白名單就行了。
      <[email protected]>: host mx2.hanmail.net[211.43.197.154]
      said:553 5.5.4 Host name(mail.mail155.cn4e.com) is not match with your
      ip(218.85.134.155), maybe it's bogus. (in reply to end of DATA
      51、
      使用者不存在。
      <[email protected]>: Recipient address rejected: User unknown in local
          recipient table (in reply to RCPT TO command)
      52、
      <[email protected]>: host
      mta-v1.mail.vip.cnb.yahoo.com[202.43.216.28]
      said: 554 delivery error: dd Sorry your message to
      [email protected] cannot be delivered. This account has been
      disabled or discontinued [#102]. - mta105.mail.cnb.yahoo.com (in reply to
      end of DATA command)
      對方goo[email protected]這個使用者有問題，
      1，客戶很久沒有用被暫停
      2，被對方管理員關閉
      3，使用者不存在（概率比較小）
      53、
      <[email protected]>: host mx.126.split.netease.com[220.181.15.137] said:
      550 Requested action not taken: mail +cHDADzX8kMVfQMA.55452S2 is
      rejected,mx9 (in reply to end of DATA command)
      The Postfix program
      <[email protected]>: host mx.mail.163.split.netease.com[202.108.9.226]
      said: 550 Requested action not taken: mail Z8AZAB3U8kNGtBYA.41560S2 is
      rejected,mx17 (in reply to end of DATA command)
      郵件內容被對方拒絕
      54、
      提示資訊：Sorry, I couldn't find a mail exchanger or IP address. (#5.4.4)
      退信原因：檢索不到接收方域名的郵件解析（MX記錄）和域名解析（A記錄）。
      解決辦法：檢查接收方域名是否有效，且正確設定了郵件解析（MX記錄）或域名解析（A記錄）。查詢命令（dos或者命令列提示符下執行）：Nslookup
      –q=mx 投遞方域名
      55、
      提示資訊：invalid address (#5.5.0)或者User unknown或者user is not found
      退信原因：沒有這個收件人。
      解決辦法：請核對對方email地址是否正確,或者有沒有變動.一般是郵件地址@前面的部分填寫有錯,請核對無誤後給對方傳送。
      56、
      提示資訊：Sorry, I couldn't find any hostnamed XXX.com. (#5.1.2)
      退信原因：沒有這個主機。
      解決辦法：一般是對方郵件地址@後面的部分有錯誤,比如把@hichina.com寫成@hichian.com,另外也有可能是對方伺服器有問題或者中間線路有問題,如果名字核對無誤,您只能讓對方解決。