2015-09-02 10:58:44,980 INFO  [qtp126151468-4888876] [name=account@domain.com;mid=537;ip=xx.xx.xx.xx;ua=ZimbraWebClient - FF40 (Win)/8.0.7_GA_6021;] smtp - Sending message to MTA at server.domain.com: Message-ID=<1187019100.8600745.14411807248
66.JavaMail.zimbra@domain.com>, origMsgId=101f0b66-b103-4161-8767-7ab1e00ffffd:1279544, replyType=w
2015-09-02 10:58:45,206 WARN  [qtp126151468-4888876] [name=account@domain.com;mid=537;ip=xx.xx.xx.xx;ua=ZimbraWebClient - FF40 (Win)/8.0.7_GA_6021;] smtp - Failed to send message
com.zimbra.cs.mailclient.smtp.InvalidRecipientException: RCPT failed: Invalid recipient acc5@otherdomain.com: 450 4.7.1 <account@domain.com>: Sender address rejected: Deferring: Too many messages from sender in last 60
        at com.zimbra.cs.mailclient.smtp.SmtpConnection.rcpt(SmtpConnection.java:680)
        [........]

[2015/09/02-10:58:45 - 28180] [CORE] INFO: module=Quotas, mode=create, host=yy.yy.yy.yy, helo=server.domain.com, from=account@domain.com, to=acc1@otherdomain.com, reason=quota_create, policy=6, quota=3, limit=4, track=Sender:account@domain.com, counter=MessageCount, quota=1.00/3 (33.3%)
[2015/09/02-10:58:45 - 28180] [CORE] INFO: module=Quotas, mode=update, host=yy.yy.yy.yy, helo=server.domain.com, from=account@domain.com, to==acc2@otherdomain.com, reason=quota_update, policy=6, quota=3, limit=4, track=Sender:account@domain.com, counter=MessageCount, quota=2.00/3 (66.7%)
[2015/09/02-10:58:45 - 28180] [CORE] INFO: module=Quotas, mode=update, host=yy.yy.yy.yy, helo=server.domain.com, from=account@domain.com, to==acc3@otherdomain.com, reason=quota_update, policy=6, quota=3, limit=4, track=Sender:account@domain.com, counter=MessageCount, quota=3.00/3 (100.0%)
[2015/09/02-10:58:45 - 28180] [CORE] INFO: module=Quotas, mode=update, host=yy.yy.yy.yy, helo=server.domain.com, from=account@domain.com, to==acc4@otherdomain.com, reason=quota_update, policy=6, quota=3, limit=4, track=Sender:account@domain.com, counter=MessageCount, quota=4.00/3 (133.3%)
[2015/09/02-10:58:45 - 28180] [CORE] INFO: module=Quotas, action=defer, host=yy.yy.yy.yy, helo=server.domain.com, from=account@domain.com, to==acc5@otherdomain.com, reason=quota_match, policy=6, quota=3, limit=4, track=Sender:account@domain.com, counter=MessageCount, quota=5.00/3 (166.7%)