how to relay mails from zimbra

[linuxguru]

hi friend,
i had configured postfix in ubuntu. now i am configuring zimbra. i have to relay mails from smtp6.mail.pw so i edited mai.cf

vi /opt/zimbra/postfix/conf/main.cf

relayhost = smtp6.mail.pw

and saved it when i reboot my zimbra machine relayhost is empty how to fix this.

second like in postfix v create sasl authentication i.e sasl_passwd

how to create sasl_passwd for authentication in zimbra.

[uxbod]

You do not need to edit the files manually Either you can set the relay through the Admin GUI or using the CLI

su - zimbra
zmprov ms `zmhostname` zimbraMtaRelayHost smtp6.mail.pw

and for SASL authentication check out : Outgoing SMTP Authentication - Zimbra :: Wiki