sobig.f and secondary MX

[mark david mcCreary]

My secondary MX machine is having a hard time keeping up with the
mailscanning of so many sobig.f virus infected emails, while my
primary MX machines are not.

I have found some clues that sobig.f's SMTP engine likes to send to
the secondary MX machine.

What happens if I keep my secondary MX machine off line for a few days.

Does anybody know what sobig.f does when it can't get thru to the secondary MX.

Thanks in advance for any insights.

mark