I have incoming delay if i send mail from google to my mail server using same provider with my mail server normal (delay < 10s)
but if i send from google mail to my mail server using other provider i have long delay mail sent with delay 20 minutes.

I using Zimbra ZCS 8.0.7_GA_6021.FOSS with multiserver environtment (separate ldap)
I check log and i have Jun 28 13:57:26 mail postfix/anvil[4154]: statistics: max connection rate 1/60s for (smtp: at Jun 28 13:52:08.
I check on mail queues zimbra administration console no message deffered or anything.

Is this connection problem or mail server setting problem?