I am looking to write a class on the Task object to categorize emails coming in or going out of the system when they are forwarded into the system by Email-To-Salesforce BCC address but they are synced the same except:

Additional To: xxxx@xxxx.com
CC:
BCC:
Attachment:

should be categorized as an Outgoing Email

while 

Additional To: 
CC:
BCC:
Attachment:

should be categorize as an Incoming Email.

How should the I write the IF statement?

Thanks!

I am looking to write a class on the Task object to categorize emails coming in or going out of the system when they are forwarded into the system by Email-To-Salesforce BCC address but they are synced the same except:

Additional To: xxxx@xxxx.com
CC:
BCC:
Attachment:

should be categorized as an Outgoing Email

while 

Additional To: 
CC:
BCC:
Attachment:

should be categorize as an Incoming Email.

How should the I write the IF statement?

Thanks!