Lately I've been experimenting with using another layer of DNS setup around mail in order to see if raw deliverability rates are improved—specifically with using DMARC records and setting up DNSSEC. Anecdotally, it does look like DNSSEC gives a bump in terms of inbox placement for some email hosts, but the domains I've been testing this on send almost exclusively transactional email. Has anyone seen a boost in their email inbox placement with the addition of DNSSEC set on their DNS records?
Zero change here for Marketo-originated emails. And unless you have a branded sender domain, SPF isn't going to be DNSSEC-signed unless Mkto signs.