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https://forums.zimbra.org/viewtopic.php?t=67535
Feb 13, 2020 · Hi, I'm new to this forum so does in Zimbra Server, I installed Zimbra ZCS 8.6 for a year, at the beginning everything seem so good, but recently I'm facing a very slow email delivery (email delivery can takes up to 3 hours to be delivered in/out) and a huge number of mail queue, I've been searching for this kind of issue before through Google, but still no luck to find the answer, I analyze ...
https://wiki.zimbra.com/wiki/Troubleshooting_Performance_Issues
It monitors various Zimbra components as well as the system as a whole to give a good picture of how the system is performing over time. Stats charts are extremely useful for troubleshooting performance issues and can often point to a bottleneck on the system itself or …
https://forums.zimbra.org/viewtopic.php?t=67535&start=20
Feb 14, 2020 · Yup the mail flow is very ok now, fyi the current mailbox of my zcs single server is about 1037 mailboxes, with 8 core processor and 32 G of RAM, is the mailbox too much? or there might be parameter that I can adjust so that my zcs can provide good services to 1037 mailboxes? thanks.
https://answers.microsoft.com/en-us/outlook_com/forum/oemail-osend/why-is-email-delivery-so-slow/3813d742-bb26-4019-9e65-1cfa8d6cf241
Jul 24, 2014 · Why is email delivery so slow? Recent issues with GMail prompted me to switch over to Outlook.com. I set up my email for my domain in Outlook.com using a send & receive account and it is working. However, emails are taking, on average, 30 minutes to an hour to be delivered to Outlook.com. This is my primary business email. ...
https://wiki.zimbra.com/wiki/Identifying_An_Unresponsive_Mail_Delivery_Service
If one or more of your MTAs is online but not sending or receiving email, there is likely a problem with one of your mail delivery services. In order to fix the problem, you will need to first identify the unresponsive service. Use the following steps to help identify the source of the problem. To find an unresponsive mail delivery service: 1.
http://docs.zimbra.com/docs/os/5.0.19/administration_guide/9_Monitoring.11.1.html
If you are having problems with mail delivery, you can view the mail queues from the administration console Monitoring Mail Queues page to see if you can fix the mail delivery problem.When you open mail queues, the content of the Deferred, Incoming, Active, Hold, …
http://docs.zimbra.com/docs/ne/6.0.8/administration_guide/9_Monitoring.16.08.html
Zimbra modifies the systems syslog daemon to capture data from the mail and local syslog facility to /var/log/zimbra.log.This allows syslogd to capture data from several ZCS components including Postfix, Amavis, ClamAV, mailboxd, zmmtaconfig, and logger.
https://www.zimbra.com/desktop7/help/en_US/Creating_Messages/Schedule_Emails_for_Future_Delivery.htm
Schedule emails for future delivery. You can compose an email and schedule email delivery for a future date. The email message that is delayed is saved to your Draft folder. Once the specified date and time is reached, the email is sent and a copy of the email is moved to the Sent folder. Compose your message.
https://www.justanswer.com/email/8189b-zimbra-e-mail-running-slow-keeps-giving-server.html
Oct 03, 2013 · My Zimbra e-mail is running very slow, keeps giving me server slow messages. - Answered by a verified Email technician ... Than start Zimbra and tell me if it is now operating correctly please. ... I try to send a message from my Yahoo address to my eastex.net address and it tells me that e-mail server. is too slow to answer and the mail fails.
https://blog.zimbra.com/2017/09/tech-center-now-17x-times-faster/
Sep 28, 2017 · Greetings, Friends. Over the last few months we received reports that our Tech Center was suffering from occasional timeouts or long waiting periods. Not good! We know that our tech articles are critical for your Zimbra deployments and/or configurations, so I have good news for you today. But first, a little background: For those new …
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