I'm trying to increase the MTA timeout on ZCS 8.0.4 Open Source - it looks like it's set to 30 seconds by default. Which command or attribute is used to change this? I'm going to be sending email to a domain that has a server which is regularly busy and may take longer than the 30 seconds to respond, so I want to increase this timeout.

Here is an excerpt from my zimbra.log that shows the 30 second timeout:

Apr 29 12:16:43 zcsmta2 postfix/smtp[5328]: 5D95E84E8: to=<user@domain.com>, relay=[]:10032, delay=10, delays=0.05/0.01/0.01/9.9, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[]:10025): 250 2.0.0 Ok: queued as 4956D84E7)
Apr 29 12:17:13 zcsmta2 postfix/smtp[5331]: connect to domain.com[]:25: Connection timed out