Hi to all

I'm migrating a Groupwise 8 to the ZIMBRA ZCS 8 .

Today, after I started to sync my own account, using 'imapsync', I started to get a problem, of a huge amount of traffic going to and from the GW GWIA to the ZCS server ..

After some analysis I disabled the routing from the GWIA to the ZCS server and also disabled the 'smart host' feature from the ZCS to the GWIA. This was because I wanted that all emails on the transition phase gone thru the GWIA server instead of the ZCS. Because of the public IP assigned to it and the reverse lookup.

The problem was caused by this traffic :

Mar 28 21:05:02 mail postfix/dkimmilter/smtpd[3983]: connect from localhost[127.0.0.1]
Mar 28 21:05:02 mail postfix/dkimmilter/smtpd[3983]: C910740603F: client=localhost[127.0.0.1]
Mar 28 21:05:02 mail postfix/cleanup[3979]: C910740603F: message-id=<20130328130847.0CD5E406051@mail.zimbra.gcf.loc al>
Mar 28 21:05:02 mail postfix/smtp[3980]: C72A9406031: to=<postmaster@mail.zimbra.gcf.local>, relay=127.0.0.1[127.0.0.1]:10030, delay=0.06, delays=0.01/0/0/0.05, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as C910740603F)
Mar 28 21:05:02 mail postfix/dkimmilter/smtpd[3983]: disconnect from localhost[127.0.0.1]
Mar 28 21:05:02 mail postfix/qmgr[3077]: C910740603F: from=<double-bounce@mail.zimbra.gcf.local>, size=1470, nrcpt=1 (queue active)
Mar 28 21:05:02 mail postfix/qmgr[3077]: C72A9406031: removed
Mar 28 21:05:02 mail postfix/smtp[3987]: C910740603F: to=<postmaster@mail.zimbra.gcf.local>, relay=none, delay=0.06, delays=0.05/0/0.01/0, dsn=5.4.6, status=bounced (mail for mail.zimbra.gcf.local loops back to myself)
Mar 28 21:05:02 mail postfix/bounce[3994]: warning: C910740603F: undeliverable postmaster notification discarded
Mar 28 21:05:02 mail postfix/qmgr[3077]: C910740603F: removed
Mar 28 21:05:32 mail postfix/smtpd[3966]: connect from mail.gcf.local[10.10.0.7]
Mar 28 21:05:32 mail postfix/smtpd[3966]: 81C35406031: client=mail.gcf.local[10.10.0.7]
Mar 28 21:05:32 mail postfix/cleanup[3976]: 81C35406031: message-id=<20130328134349.96ECA406051@mail.zimbra.gcf.loc al>
Mar 28 21:05:32 mail postfix/qmgr[3077]: 81C35406031: from=<double-bounce@mail.zimbra.gcf.local>, size=1224, nrcpt=1 (queue active)
Mar 28 21:05:32 mail postfix/smtpd[3966]: disconnect from mail.gcf.local[10.10.0.7]
Mar 28 21:05:32 mail postfix/dkimmilter/smtpd[3985]: connect from localhost[127.0.0.1]
Mar 28 21:05:32 mail postfix/dkimmilter/smtpd[3985]: 836E040603F: client=localhost[127.0.0.1]
Mar 28 21:05:32 mail postfix/cleanup[3979]: 836E040603F: message-id=<20130328134349.96ECA406051@mail.zimbra.gcf.loc al>
Mar 28 21:05:32 mail postfix/smtp[3980]: 81C35406031: to=<postmaster@mail.zimbra.gcf.local>, relay=127.0.0.1[127.0.0.1]:10030, delay=0.05, delays=0.01/0/0/0.04, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 836E040603F)
Mar 28 21:05:32 mail postfix/dkimmilter/smtpd[3985]: disconnect from localhost[127.0.0.1]
Mar 28 21:05:32 mail postfix/qmgr[3077]: 836E040603F: from=<double-bounce@mail.zimbra.gcf.local>, size=1463, nrcpt=1 (queue active)
Mar 28 21:05:32 mail postfix/qmgr[3077]: 81C35406031: removed
Mar 28 21:05:32 mail postfix/smtp[3990]: 836E040603F: to=<postmaster@mail.zimbra.gcf.local>, relay=none, delay=0.06, delays=0.04/0/0.01/0, dsn=5.4.6, status=bounced (mail for mail.zimbra.gcf.local loops back to myself)
Mar 28 21:05:32 mail postfix/bounce[3994]: warning: 836E040603F: undeliverable postmaster notification discarded
Mar 28 21:05:32 mail postfix/qmgr[3077]: 836E040603F: removed

I've disabled all AV/SPAM features for now, but I still can't figure out why this started to happen.

Any ideas and insights are very welcome, as a brief search in the forum didn't took me to a particular solution ...

Cheers.

Jorge Gomes