Shulou(Shulou.com)06/03 Report--

I encountered a problem last week, which has been solved now, but I think the process is worth sharing with the email maintenance staff.

All of a sudden, a user said that he had received a rejection letter. These users are all users on the Exchange server, and they can't even send e-mail to the cloud users on their company. The error reported to me is a screenshot with no valuable information.

Faced with this problem, I immediately logged in to the management side of O365 (our mail environment is a mixed deployment), went to mail flow, message trace, filled in the sender and recipient information, and then searched

I can't believe the conclusion is Delivered.

Later, I got a rejection log from a local IT, and there was a very useful sentence.

When I saw this, my subconscious reaction was filtered. As a relatively senior person, come here to check right away. Https://mxtoolbox.com/blacklists.aspx

I hope you will save the above website.

Turns out it's actually on the blacklist. The solution, of course, is to go to the spamhaus to submit an application. This website is a bit cramped. When you visit in China, you will find that some content will not be displayed, because the framework used in this website will not be displayed when we visit it. With the assistance of my colleagues at headquarters, I submitted an application, then received a verification email, and removed our domain name from the list.

In fact, there is another way to solve this problem, is to build a new send connector, from the local, do not take the Microsoft Cloud send connector, but the company's mail flow is centrally managed, so still follow the old rules.

If two companies send email to each other, you can consider from this point of view whether a domain name has been filtered. The most important way to solve this problem is to read the log and have a clear way to solve the problem.

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