Slow sending emails

[glenn_btn]

Hi All

Have a couple of server running Zimbra 8.6.0 on Ubuntu. These servers have been running fine since their build with no issues.

Last week we needed to move data centres. Changed the DNS cache in Zimbra along with all the ip details and MTA bits and DNS servers. No when a user composes and emails in the front end and click send, it takes around 7 seconds to sent. I have tested the data centre DNS servers with NSlookups and these all seem to respond quickly and also if I do a host -a mail.google.com and following instructions from the https://wiki.zimbra.com/wiki/DNS_cachin ... (dnscache)

Can anyone advise what the issue may be or where I can look to resolve. Don't seem to get anywhere looking at log files but thinking it's dns somewhere along the line but everything looks as it did before but just different ip's

Thanks

Glenn

[davidkillingsworth]

Did you ever end up fixing this issue?

If so, how?

Thanks,
David