DMARC and SPF policy (own domain)

What is a good advice to use for DMARC and SPF policy for own domain, and does runbox respect these policies for own hosted domains?

e.g. is this ok - or is it to strict, that e-mails will not get through?

SPF
v=spf1 include:spf.runbox.com -all

DMARC
v=DMARC1; p=quarantine; rua=mailto:dmarc@mydomain.com; pct=100;