tp3._spf.schwab.com has no MX records.
Question and response
Question
dig tp3._spf.schwab.com. MX
Answer
The response has no answer records.
Authority
schwab.com. 600 SOA d33pf2cdc.schwab.com. dnsadmin.schwab.com. 2023022029 3600 900 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0