Hi wires12,
First of all, thanks for being a PLATINUM SUPPORTER! Your support is much appreciated. (For those interested in becoming supporters, please visit the DONATE button at the top of this page.)
Here is what you are looking for:
db domains setprop domain.tld MailServer a.b.c.d
signal-event email-update
So I believe your solution is:
db domains setprop lexairinc.com MailServer 74.125.45.26
signal-event email-update
Hope this helps.
Thanks again,
kruhm