Why my zimbra server suddenly cannot send email to some other domains

[lowhigh]

Hi everybody!

I'm using Centos6 with Zimbra Release 8.7.0_GA_1659.RHEL6_64_20160628192545 RHEL6_64 FOSS edition
Everything go well until today, i only cannot send email from this Zimbra server to some other domains, especially domains live on ZOHO mail server. Note that: I still send to Gmail, Live mail and many emails of my customer aslo partner.......
From webmail, when click SEND button, the bounce message was returned immediately.
This is the Returned to Sender

This is the mail system at host mail.zimbra.server.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<info@zimbra.server>: zimbra.server

This is the log fie:

Mar 28 15:53:14 mail postfix/smtp[19257]: F34A9168832: to=<info@zoho.server>, relay=127.0.0.1[127.0.0.1]:10032, delay=0.18, delays=0.09/0.01/0.01/0.07, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 2843E168839)
Mar 28 15:53:14 mail postfix/qmgr[7287]: F34A9168832: removed
Mar 28 15:53:14 mail postfix/error[19258]: 2843E168839: to=<info@zoho.server>, relay=none, delay=0.03, delays=0/0.01/0/0.02, dsn=5.0.0, status=bounced (zoho.server)
Mar 28 15:53:14 mail postfix/cleanup[18214]: 2FB3B16883D: message-id=<20180328085314.2FB3B16883D@mail.zimbra.server>
Mar 28 15:53:14 mail postfix/qmgr[7287]: 2FB3B16883D: from=<>, size=4834, nrcpt=1 (queue active)
Mar 28 15:53:14 mail postfix/bounce[19259]: 2843E168839: sender non-delivery notification: 2FB3B16883D
Mar 28 15:53:14 mail postfix/qmgr[7287]: 2843E168839: removed
Mar 28 15:53:14 mail postfix/lmtp[18363]: 2FB3B16883D: to=<info@zimbra.server>, relay=mail.zimbra.server[123.x.x.x]:7025, delay=0.2, delays=0.01/0/0.14/0.05, dsn=2.1.5, status=sent (250 2.1.5 Delivery OK)
Mar 28 15:53:14 mail postfix/qmgr[7287]: 2FB3B16883D: removed

So i check my server config

[zimbra@mail ~]$ zmprov gcf zimbraMtaRestriction
zimbraMtaRestriction: reject_invalid_helo_hostname
zimbraMtaRestriction: reject_non_fqdn_helo_hostname
zimbraMtaRestriction: reject_non_fqdn_sender
zimbraMtaRestriction: reject_unknown_sender_domain
zimbraMtaRestriction: reject_rbl_client bl.spamcannibal.org
zimbraMtaRestriction: reject_rbl_client bl.spamcop.net
zimbraMtaRestriction: reject_rbl_client dnsbl.njabl.org
zimbraMtaRestriction: reject_rbl_client cbl.abuseat.org
zimbraMtaRestriction: reject_rbl_client pbl.spamhaus.org
zimbraMtaRestriction: reject_rbl_client sbl.spamhaus.org
zimbraMtaRestriction: reject_rbl_client xbl.spamhaus.org
zimbraMtaRestriction: reject_rbl_client zen.spamhaus.org
zimbraMtaRestriction: reject_rbl_client smtp.dnsbl.sorbs.net
zimbraMtaRestriction: reject_rbl_client socks.dnsbl.sorbs.net
zimbraMtaRestriction: reject_rbl_client web.dnsbl.sorbs.net
zimbraMtaRestriction: reject_rbl_client zombie.dnsbl.sorbs.net
zimbraMtaRestriction: reject_rhsbl_client dbl.spamhaus.org
zimbraMtaRestriction: reject_rhsbl_client multi.surbl.org
zimbraMtaRestriction: reject_rhsbl_client rhsbl.sorbs.net
zimbraMtaRestriction: reject_rhsbl_reverse_client dbl.spamhaus.org
zimbraMtaRestriction: reject_rhsbl_sender dbl.spamhaus.org
zimbraMtaRestriction: reject_rhsbl_sender multi.surbl.org
zimbraMtaRestriction: reject_rhsbl_sender rhsbl.sorbs.net

and

Code: Select all

[zimbra@mail ~]$ postconf mynetworks
mynetworks = 127.0.0.0/8 123.x.x.x/25

And i test again by send a email from zoho.server to zimbra.server. It's very good

Please tell me what can i do?

Thanks everybody!

[lowhigh]

Please help me!

[phoenix]

Please help me!

The problem is that you've given no information about the reason your mail was rejected by the other server other than it was bounced. You need to look at the bounce message and there should be a reason listed in there and that should tell you why it was rejected. Although this has nothing with the reason you mail was bounced but I'd also suggest you have too many restrictions in place on your server, a lot of them will reject mail unnecessarily.

[lowhigh]

Please help me!

The problem is that you've given no information about the reason your mail was rejected by the other server other than it was bounced. You need to look at the bounce message and there should be a reason listed in there and that should tell you why it was rejected. Although this has nothing with the reason you mail was bounced but I'd also suggest you have too many restrictions in place on your server, a lot of them will reject mail unnecessarily.

Hi phoenix!

These are all logs i have, bounce mail returned, log from zimbra log and i also disable all Policies by Policyd. Do you have any ideas. I really never against to this situation. Do you think Zoho server mail reject my Zimbra Server?

Please give me an advice!