When sending email to a user on the Symantec Email Security.cloud service, the message is rejected. The sender receives a non-delivery email with a 500 series error code indicating that the recipient is invalid.
在发送电子邮件后收到错误时,这很令人沮丧。 本文介绍如果在未送达报告中看到错误代码 550 5.1.1 到 5.1.20(也称为 NDR、弹跳消息、传递状态通知或 DSN),则可以执行的操作。 展开表 我收到了这个弹跳消息。 如何解决问题? 下面是可以尝试自行解决问题的一些步骤。
Hard bounces (500 Series): These indicate permanent problems with email delivery. Examples include non-existent email addresses (code 550), unauthorized users (code 551), or incorrect domain names (code 554). Hard bounces require immediate action, such as verifying the recipient's email address o...
管理员的诊断信息部分 #550 4.4.7 QUEUE.Expired; message expired ## 拒绝系统认为该邮件太旧,要么是因为该主机停留的时间过长,要么是因为邮件发送方指定的生存时间值被超出。 450 4.7.0 Proxy session setup failed on Frontend with '451 4.4.0 Primary target IP address responded with ...请...
Error code returned For more information 421 - [Too many sessions opened] Comcast allows 25 simultaneous connections per sending IP address. This error results when that limit is exceeded. 421 - [Reverse DNS failure : Try again later] Comcast requires all sending IP addresses have a valid rDNS...
I've imported my contact list and have tried sending a number of mail messages from a POP address I added using a domain that I own, set up in Zoho and verified. Anytime I've tried sending a message from any account other than a Yahoo account, I get the error message "Reas...
For more information, see Fix email delivery issues for error code 5.1.8 in Exchange Online. 5.1.10 Recipient not found The recipient's <SMTP Address> wasn't found by SMTP address lookup. For more information, see Fix email delivery issues for error code 550 5.1.10 in Exchange Online. 55...
How to Fix SBCGlobal Email 550 Error? Posted on April 15, 2024 by emailprosolutions Southwestern Bell Telephone Company, commonly referred to as SBCGlobal, is a wholly-owned subsidiary of the American Telephone and Telegraph Company (AT&T). Today, the SBCGlobal email service is used by millions...
Starting October 15th, Exchange Online will reject emails with multiple From addresses without a Sender header, to comply with RFC 5322. Organizations should ensure a single address in the Sender header to avoid non-delivery reports (NDRs) with error code 550 5.1.20. Feedback on this ...
problems with the recipient's email address. By verifying the email settings in Microsoft 365, you can ensure that your emails are set up correctly and minimize the chances of future bounce-backs. Check out theFix NDR error code "550 5.1.1" through "550 5.1.20" in Exchange Onlinearticle....