BIS and Lotus Notes
 

Hello,
I try configure my BB device with corporate e-mail server and BIS (a few accounts).
I tested BB on postfix linux server and Lotus Notes 7 (both works on IMAP SSL ports)
I have a following problem:
If I send e-mail to Linux account BB device received e-mail immediately (1-2 minutes delay).
If I send e-mail to Lotus Notes account I received e-mail form 1 min to 40 min on BB device.
Network configuration for Linux and Lotus system is the same.
How I can change this time on Lotus system?
Please, help me.
Regards,