Can't Seem To Configure Getmail and Zimbra Correctly

[Dark Phoenix]

Okay, I have my Zimbra server (Collaboration Suite FOSS version) fully configured and working. However, specific email accounts need to have the email printed and then downloaded on a specific schedule every day. Automatic polling of an external POP3 account doesn't work because the hours need to be precise ("every 3 hours" isn't precise enough).

I tried configuring Getmail to download & print the emails via cron, but Zimbra seems to randomly lose emails this way (emails will print and then not download into the system). I have it configured as an MTA_external source using /opt/zimbra/postfix/sbin/sendmail as the target.

The exact configuration is as follows:

[retriever]
type = SimplePOP3SSLRetriever
server = mail.magma.ca
username = hgc_orderprocess
password = (BLOCKED)

[destination]
type = MultiDestination
destinations = ('[zimbra]','[printmail]')

[zimbra]
type = MDA_external
path = /opt/zimbra/postfix/sbin/sendmail
arguments = ("-t",)
user = orderprocessing


[printmail]
type = MDA_external
path = /usr/local/printmail/printmail.php
arguments = ('--title="Order Processing"',)

[options]
delete = true

[Dark Phoenix]

Oh, sorry for not mentioning it earlier, but I have searched the forums for answers. I wasn't able to find anything on this particular problem.