We have installed Zimbra 5.0 RC 2 on 4 servers - a distributed installation with the following configurations:
Server 1 MTA and Mailbox 1
Server 2 LDAP
Server 3 Mailbox 2
Server 4 Mailbox 3
MTA authenticates against Mailbox 1.
We have currently the following problem: SMTP requests are most of the time quite slow, so that it takes more that one minute to send an email via the MTA with or without authentication. It seems that after the MAIL FROM: SMTP command the system waits for 20 to 30 seconds and after the RCPT TO: also.
Has someone experienced similar problems?