MTA relay without SSL

[benizim]

Hi, I am new to dns/postfix and zimbra, i follow the instruction and setup zcs 6 os at my centos5.3 server. I used zimbra relay my isp hosting email, incoming work great but sending hit the rock.

i get this error while sending email

 This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server.

according to wiki Outgoing SMTP Authentication - Zimbra :: Wiki

it is only mention smtp auth with ssl

echo mailrelay.example.com username:password > /opt/zimbra/conf/relay_password

postconf -e smtp_sasl_password_maps=hash:/opt/zimbra/conf/relay_password

postconf -e smtp_sasl_auth_enable=yes

my isp mail doesnt require ssl smtp, how can i authenticate without ssl in this case?

Thank you

[phoenix]

my isp mail doesnt require ssl smtp,

That would be rather strange.

how can i authenticate without ssl in this case?

How about using the Admin UI to set-up the relay.

[benizim]

yes, i used Admin UI to set-up the relay, but it bounces, so i follow this link
Outgoing SMTP Authentication - Zimbra :: Wiki

the problem still persist

Dec  3 15:55:58 mail postfix/smtp[5274]: 6B3013D8B5A: to=, relay=mail.xxxmail.com[1xx.1xx.2xx.1xx]:587, delay=0.64, delays=0.04/0.01/0.52/0.06, dsn=5.0.0, status=bounced (host mail.xxxmail.com[1xx.1xx.2xx.1xx] said: 503 This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server. (in reply to RCPT TO command))

Configuration output:

[zimbra@mail conf]$ zmprov gs mail.myzimbraserver.com | grep -i -e auth -e mode
zimbraBackupMode: Standard
zimbraMailMode: http
zimbraMailReferMode: wronghost
zimbraMtaAuthEnabled: TRUE
zimbraMtaAuthHost: mail.myzimbraserver.com
zimbraMtaAuthTarget: TRUE
zimbraMtaAuthURL: http://mail.myzimbraserver.com:80/service/soap/
zimbraMtaSaslAuthEnable: TRUE
zimbraMtaTlsAuthOnly: FALSE
zimbraReverseProxyImapStartTlsMode: only
zimbraReverseProxyMailMode: http
zimbraReverseProxyPop3StartTlsMode: only

Thanks for help !!!

[phoenix]

yes, i used Admin UI to set-up the relay, but it bounces, so i follow this link
Outgoing SMTP Authentication - Zimbra :: Wiki

Then you will have to contact your ISP and confirm their requirements for Authentication.