_spf.credit-suisse.com has no MX records.
Question and response
Question
dig _spf.credit-suisse.com. MX
Answer
The response has no answer records.
Authority
credit-suisse.com. 30 SOA uranus.ubs.com. ncc-internet.ubs.com. 9035 10800 3600 2592000 30
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0