Unable to send mails to External Mail servers

i installed zcs 6.0 on fedora 11 .. OS.. and am using lcal Domain name for zimbra mta..

all sending and receiving mails to intrnals accounts are working fine.

since i am using local domain . i know that i am unable to receive mails from Extrnal mails. but why cant am not able to send mails to external mails.

what information i am supposed to fill in relay MTA for external..??


anybody can help me pls...


thank u very much in advance .

Welcome to the forums :)

Use your upstream ISP SMTP relay.

recently i inastalled zimbra colloboration suite 6 in fedora 11 OS as mailserver for our University. My university is providing many services to students.. it is difficult for a student to remember so many passwords .. what they suggested is use Single Signon authentication for all services...


In zimbra Administrator guide some external authentication....mentioned.. but i am not clear with that..


How can use different LDAP service to do authentication???

Is it necessary to have user account details in both zimbra LDAP and external LDAP???



thanks in advance..

Please start a new thread when changing the subject matter.

Though in response to your question you will still need to define the user in the Zimbra LDAP but the password can be checked against a external LDAP source.

please i have the same problem i 'm unable to send to external domains please more details about the solution , i use zimbra 7 open source version

Thanks.