Patch for do_sendmail.c for later sendmail releases

[I posted this earlier in the week but attached to another thread. Sending again in case it's of interest to others]

In setting up the sendmail graphs, I found that some fields introduced in later sendmail versions were not logged/displayed.

The attached patch to do_sendmail.c will allow the extra field introduced in sendmail 8.13.x to be graphed. It should still work with most earlier versions of sendmail back to at least 8.9.x (if you're running a version that old, it's time to upgrade!)

As we only run 8.13.x in production, Testing with 8.11.x has been minimal.

Regards Geoff Steer Firstwave Technology