Is it possible to use SPF entries with the mail hosting on everleap? I'm having trouble getting mail through to a client with a particularly tight mail filter and despite ip whitelisting etc we can't get mail through from everleap. Mail delivered via mailgun on the same domain works just fine. Mailgun has an SPF entry and my core domain does not. Edit: I originally made this question about DMARC, but realized SPF was probably more likely to be the culprit.