MailCamp supports full DMARC compliance.
Contact MailCamp support to ask about DKIM configuration. For more information, visit: https://www.mailcamp.nl/email-marketing/spf-record-en-dkim-key-toevoegen-aan-de-dns-van-mijn-domein/
Add 'include:_spf.exsilia.net' to your SPF, however that pulls in more than you need. For more information, contact MailCamp support or visit: https://www.mailcamp.nl/email-marketing/spf-record-en-dkim-key-toevoegen-aan-de-dns-van-mijn-domein/