Thanks a lot. Here is my telnet log:
[root@localhost ~]# telnet webmail2.sonicwall.com 110
Trying 10.50.128.192...
Connected to webmail2.sonicwall.com.
Escape character is '^]'.
+OK The Microsoft Exchange POP3 service is ready.
user sdevassy
+OK
pass xxxxxx
-ERR Logon failure: unknown user name or bad password.
I tried with user SUX\sdevassy and user SUX\sdevassy\Sinil Devassy (domain name\user name\mail box) with no luck.
I have sent an email to my Corporate IT infrastructure Mgmt Team. Waiting response from them.. Will update you then.....
Once again, many many thanks for pointing me the right direction.