I have been seen following messages in the zimbra.log

I have tried to search in google and inside of this forum, the only links i have found are:
Postfix service unavailable error - Server Fault

In the postfix readme and milter info i could not find anything about SMFIC_BODYEOB

Mar 11 03:52:16 hostname postfix/cleanup[64724]: warning: milter inet:$hostname.$domain:7026: can't read SMFIC_BODYEOB reply packet header: Success
Mar 11 03:47:20 hostname postfix/smtpd[64720]: 3BCB24E01C3: client=eu1sys200amx110.postini.com[]
Mar 11 03:47:56 hostname postfix/cleanup[64724]: 3BCB24E01C3: message-id=<BLU168-W11426275ACD8B1AE69BC92CD9740@phx.gbl>
Mar 11 03:52:16 hostname postfix/cleanup[64724]: 3BCB24E01C3: milter-reject: END-OF-MESSAGE from eu1sys200amx110.postini.com[]: 4.7.1 Service unavailable - try again later; from=<$usermail@hotmail.com> to=<$user@$hostna> proto=SMTP helo=<psmtp.com>

I have check all posibilities, the ptr zone, the domain, the hardware of the server, and about the user and group is zimbra who run it.
Any body has any idea what is happening here? or where should i check?