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You will probably get more info at message queue on Exchange server.<br />
I vote for problems on the other side.
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<div>
if you look at the message header you can find out<br />
<br />
copy and paste the headers in there and you will see the timings<br />
<br />
<a href="https://mxtoolbox.com/EmailHeaders.aspx" rel="ugc">https://mxtoolbox.com/EmailHeaders.aspx</a>
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I go to email properties to check the send out email header but is bland empty. should I look the incoming email or outgoing email header?
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None of them ever left your server, that why you have smtp header empty. Incoming mail it is just notification from your server. If it had some info about why the original message is delayed, you would see that in the message body. You will need to check the message queue for the reason.<br />
<a href="https://blogs.technet.microsoft.com/exchange/2007/01/09/a-quick-tour-of-queue-viewer-in-exchange-server-2007/" rel="ugc">https://blogs.technet.microsoft.com/exchange/2007/01/09/a-quick-tour-of-queue-viewer-in-exchange-server-2007/</a>
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<div>
you mean I should check the bounce back email header and paste it to the MXTOOL box to see what happen?
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I go to check today and test yahoo email again, but this time it go without any issue and yahoo email receive right the way. but I still saw some retry status, is that mean all these retry mean not send out successfully?<br />
<a href="https://filedb.experts-exchange.com/incoming/2017/05_w18/1159835/Queue-Viewer-result.jpg" target="_blank" class="file-inline" title="queue (81 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>Queue-Viewer-result.jpg</a>
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Queue-Viewer-result.jpg

<div>
Yes, they are not sent yet.<br />
It looks like DNS server you are using for delivery have some problems.<br />
I would check your DNS servers first. If you are using forwarders you can try to change them to some others - like google's 8.8.8.8 and 8.8.4.4.
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<div>
to analyse &nbsp;message headers you need the email from the recipient, i was assuming that you had a yahoo account you were using to test.<br />
Thats the only way you get the stop off points in the journey
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<div class="content wysiwyg-content">
hi,<br />
<br />
don't know why recently we send email to yahoo user always get delay couple hour. but I try use Hotmail send then yahoo email get right away. where I can find out the reason? I have created a yahoo account to test it .figure out even get delay, but finally I still get email in yahoo.<br />
<a href="https://filedb.experts-exchange.com/incoming/2017/05_w18/1159800/Delay.jpg" target="_blank" class="file-inline" title="delay (94 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>Delay.jpg</a>
</div>
</div>


Delay.jpg

hi,

don't know why recently we send email to yahoo user always get delay couple hour. but I try use Hotmail send then yahoo email get right away. where I can find out the reason? I have created a yahoo account to test it .figure out even get delay, but finally I still get email in yahoo.

Exchange server send email to yahoo delay

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.