Oracle apps Work Flow mailer inbound response - Unable to connect to the mail account. Check the host, user name and password

++ We I trying to setup Work Flow mailer inbound response process,

By edit Applications System:UAT > Workflow > Service Components > Component Details >

Getting

"Unable to connect to the mail account. Check the host, user name and password"

Diag and Solution:

 Checking Mail server in lunix application server.
++ [appluat@ ~]$  ping  <Exchange Server IP>
PING  **.***.***.** ( **.***.***.**) 56(84) bytes of data.
64 bytes from **.***.***.**: icmp_seq=1 ttl=124 time=0.791 ms
64 bytes from  **.***.***.**: icmp_seq=2 ttl=124 time=0.926 ms 

++[appluat@ZA-OHCSA-UAT-01 ~]$ telnet <Exchange Server IP> 143
Trying **.***.***.**...
Connected to **.***.***.**.
Escape character is '^]'.
* OK The Microsoft Exchange IMAP4 service is ready.

++ Then try to login to the exchange server.

[appluat@ ~]$ telnet  <Exchange Server IP> 143
Trying  **.***.***.**...
Connected to **.***.***.**
Escape character is '^]'.
* OK The Microsoft Exchange IMAP4 service is ready.
1 login username <password>
1 BAD Command received in Invalid state.

In the above login when we have password with special charter (like @).
then i was not able to login ,so i  changed the password as simple and tried.

[appluat@ ~]$ telnet <Exchange Server IP> 143
Trying **.***.***.**...
Connected to **.***.***.**...
Escape character is '^]'.
* OK The Microsoft Exchange IMAP4 service is ready.
1 login mailserverusername Password
1 OK LOGIN completed.