Based on the error code that you provided us (Error ID: 0x800CCC0D), the following are the possible causes to this issue: 1. Incorrect POP settings (usually the SSL option for SMTP) – please check with your provider if it is required or not. 2. Firewall blocking ports (usually port 25) – could be 3rd party…

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[Return Code 451] sid: Ve9e1o0012Rj2se01 :: Sorry, I wasn’t able to establish an SMTP connection. I’m not going to try again; this message has been in the queue too long. Typically, 451 errors are due to the receiving server rejecting your email. This can happen for a number of reasons but most likely is due…

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421, “4.4.5”, Server busy, try again later. 421, “4.7.0”, IP not in whitelist for RCPT domain, closing connection. 421, “4.7.0”, Our system has detected an unusual rate of unsolicited mail originating from your IP address. To protect our users from spam, mail sent from your IP address has been temporarily blocked. Review our Bulk Email…

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Problem: SMTP 5.1.2 Error when sending an email, What does it mean? Solution:SMTP 5.1.2 Error message indicates the domain name is incorrect or doesn’t exist in the address the message was sent to. Verify again whether the e-mail address is correct and try to change the Outlook mode to the online mode if it does…

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 The following are very general error messages and an explanation of what they mean. 退信代码说明:  •421 HL:REP 该IP发送行为异常,存在接收者大量不存在情况,被临时禁止连接。请检查是否有用户发送病毒或者垃圾邮件,并核对发送列表有效性;  •421 HL:ICC 该IP同时并发连接数过大,超过了网易的限制,被临时禁止连接。请检查是否有用户发送病毒或者垃圾邮件,并降低IP并发连接数量;  •421 HL:IFC 该IP短期内发送了大量信件,超过了网易的限制,被临时禁止连接。请检查是否有用户发送病毒或者垃圾邮件,并降低发送频率;  •421 HL:MEP 该IP发送行为异常,存在大量伪造发送域域名行为,被临时禁止连接。请检查是否有用户发送病毒或者垃圾邮件,并使用真实有效的域名发送;  •450 MI:CEL 发送方出现过多的错误指令。请检查发信程序;  •450 MI:DMC 当前连接发送的邮件数量超出限制。请减少每次连接中投递的邮件数量;  •450 MI:CCL 发送方发送超出正常的指令数量。请检查发信程序;  •450 RP:DRC 当前连接发送的收件人数量超出限制。请控制每次连接投递的邮件数量;  •450 RP:CCL 发送方发送超出正常的指令数量。请检查发信程序;  •450 DT:RBL 发信IP位于一个或多个RBL里。请参考http://www.rbls.org/关于RBL的相关信息;  •450 WM:BLI 该IP不在网易允许的发送地址列表里;  •450 WM:BLU 此用户不在网易允许的发信用户列表里;  •451 DT:SPM ,please try again 邮件正文带有垃圾邮件特征或发送环境缺乏规范性,被临时拒收。请保持邮件队列,两分钟后重投邮件。需调整邮件内容或优化发送环境;  •451 Requested mail action not taken: too much fail authentication 登录失败次数过多,被临时禁止登录。请检查密码与帐号验证设置;  •451 RP:CEL 发送方出现过多的错误指令。请检查发信程序;  •451…

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Common Bouncebacks with Email Bounceback Error Cause of Error Resolution 552 The message was rejected because it contains prohibited virus or spam content The email message contains a link, attachment, or pattern caught by our filters as spam or a possible virus. Remove the content causing the error. 554 The message was rejected because it…

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