Trouble with sending otp mail

[robin....@gmail.com]

i have downloaded the VMWare app from rcdevs.com which has inbuilt ldap server and otp pre-installed running on CentOS. i created a test user in the ldap root directory and then configured the email id of d user as ad...@ab.xyz.com(which is the admin id of zimbra mail server) changed the servers.xml file in /opt/webadm/conf/ so that it can use the zimbra mail servers SMTP for sending mail(also disable sendmail on this VMWare OS) den wen i go to d user in ldap in webadm and den to OTP Authentication Server - Test User Login-entered the LDAP password then it ask for the mail password-but i dont receive any mails wen checked in the mails-in the logs it gives the follwng mesg-Jan 31 14:30:13 rcvm sendmail[11456]: r0V90DXp011456: to=ad...@ab.xyz.com, ctladdr=webadm (101/101), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30400, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]
Any Help??

[Administrators]

If the mail server is local then keep the MailServer XML block
commented.
WebADM will use the local mailer in this case.

[robin....@gmail.com]

The mail server is not local but is on the same LAN. i have uncommented MailServer XML block and given the ip address of the mail server in the XML block .