Motorola Droid2 IMAP Not Sending Outgoing through Zimbra

[the_griz]

ZCS version: 7.0.0.6298

We have several Motorola DroidXs in the office and they can do active sync just fine. All with Verizon.

We have a user who preferred a Motorloa Droid2 with Verizon. It runs Android 2.2. I have tried to set up Active Sync and it fails to login - the setup is different than on the DroidXs. So I tried to set up the account as an IMAPS account. It receives email fine but will not send.

I have verified the settings to be correct. I used these settings from an IMAPS connection locally and it was successful.
Authenticated SMTP on Port 25 using TLS.

When the phone tries to send email through Zimbra I see this in the /var/log/maillog:

Mar 11 09:37:33 mail postfix/smtpd[5052]: connect from 146.sub-174-252-3.myvzw.com[174.252.3.146]
Mar 11 09:37:33 mail postfix/smtpd[5052]: lost connection after UNKNOWN from 146.sub-174-252-3.myvzw.com[174.252.3.146]
Mar 11 09:37:33 mail postfix/smtpd[5052]: disconnect from 146.sub-174-252-3.myvzw.com[174.252.3.146]

Any ideas on how to troubleshoot this either on the phone or at the server?

Thanks!
Tom