Marketo user ED and I independently discovered (see this post [https://nation.marketo.com/message/121431]) that once Firefox DE upgraded to v46, embedded forms would no longer submit. It →
Modern (or maybe I mean young!) DNS admins don’t understand SPF as well as you might think. Another reason to not give them DNS tasks unless you’ve really proven the need. →
A pervasive Marketo myth is that you must have SPF and DKIM set up for your From: domains. Truth is you only need DKIM and never need SPF for your From: domain. (If — and only if — you have a custom envelope domain, you‘ll want SPF for that.) →