iRule to modify SMTP mail content

Hi,

I could not test, but basically you have to replace the TCP::payload. I also think that the [string match] you need to change the pattern to "*Exchange2010R2*" As a tip, write some logs with the values of the things on the main points to see if everything is going well and then remove. See if this helps you. []

 when CLIENT_ACCEPTED {
    TCP::respond "220\r\n" 
    TCP::collect 2000 
} 
when CLIENT_DATA { 
    set cdata [TCP::payload] 
    if { $cdata starts_with "DATA" } { 
        if { [string match "*Exchange2010R2*" $cdata ]} {
            TCP::payload replace 0 [TCP::payload length] [string map {"Sent From:" "Sent From:\nExchange 2010 R2 Server\n"} [TCP::payload]]
        }
    } 
    TCP::release 
    TCP::collect 
}