How can i see traffic being dropped by Firewall?

Hi All. I have a problem where users on the inside of my network cannot receive emails when they use outlook and windows live to external mail servers. If email is unencrypted (eg hotmail) there are no issues. If however email is encrypted ( gmail on por 465 or outlook over ssl) then the users can receive but cannot send emails. I have already disable inspect esmpt and i have removed any outbound access-list. I want to see if there is anything elese that could be blocking the traffic. How can i do that?
My Firewall config it attached.
Marlon

Hi All. I found a work around for the problem. I took Jose's advice and looked at it from the end point and found that windows 7 handles tcp windowing diffrently than previous OS's. I still think there is an issue somewhere but i am not sure where esle to look so i will work with this for now.
See note below. Thanks for your help guys.
Disable the auto tuning
Check the state or current setting of TCP Auto-Tuning
1.          Open elevated command prompt with administrator’s privileges.
2.          Type the following command and press Enter:
netsh interface tcp show global
The system will display the following text on screen, where you can check on the Auto-Tuning setting:
Querying active state…
TCP Global Parameters
Receive-Side Scaling State : enabled
Chimney Offload State : enabled
Receive Window Auto-Tuning Level : normal
Add-On Congestion Control Provider : none
ECN Capability : disabled
RFC 1323 Timestamps : disabled
Disable TCP Auto-Tuning
1.          Open elevated command prompt with administrator’s privileges.
2.          Type the following command and press Enter:
netsh interface tcp set global autotuning=disabled
Enable TCP Auto-Tuning
1.          Open elevated command prompt with administrator’s privileges.
2.          Type the following command and press Enter:
netsh interface tcp set global autotuning=normal
http://www.mydigitallife.info/disable-tcp-auto-tuning-to-solve-slow-network-cannot-load-web-page-or-download-email-problems-in-vista/

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How can i see traffic being dropped by Firewall?

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