Find IP address of rejected email by IMF

I am having trouble getting IMF to allow an email from the bank. In the past when an email was rejected I would juts add the IP of the sender to the IMF and the emails would flow through. The tech support guy at the bank gave me some IP's, non seem to work. The message is still rejected by IMF. I enabled SMTP logging. I cannot seem to figure out which email in the logs is coming from the bank. How can I find the correct IP address in a log? Also these are encrypted  emails. Not sure if that means anything.

Here is the message ID if that helps
380b_0134_0de853ba_6198_11e2_a8f3_005056921013@smail.cbank.com
Thank you
SkunnyAsked:
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als315Commented:
Simplest way - ask bank staff.
You can also calculate mask here: http://www.subnet-calculator.com/
And you can try to enter one of addresses here:
http://whois.domaintools.com
If IP addresses are registered to bank, you will see range
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als315Commented:
You can open log file (The Default Logfile directory is c:\Program Files\ExchSrvr\Servername.LOG) with any text editor and find record with this messageID.
Details you can find here:
http://www.msexchange.org/articles-tutorials/exchange-server-2000/monitoring-operations/Logging_the_SMTP_Service.html

Or temporarily disable filtering and look as message header
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SkunnyAuthor Commented:
OK that worked. But it seems this email server changes IP's everytime time it sends out emails. Under message delivery\Properties \Connection FIltering\Accept. How do i add a group of IP's without adding all 255 of them. It ask for the subnet address and the subnet mask.
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als315Commented:
I have no Exchange 2003 more and can't test, but here:
http://technet.microsoft.com/en-us/library/aa998793(v=exchg.65).aspx
declared ability to add a range of IP addresses (Click Group of IP Addresses to add a subnet address and mask to the global deny list)
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SkunnyAuthor Commented:
I would I find the subnet to an outside IP?
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