Please add the link to setup SPF and MX record and DKIM. I have not found any option to add DKIM.
We can add SPF but it is not mentioned anywhere.
which is TXT @ v=spf1 include:mailbox.org
Also please mention about DMARC.
DMARC is just a TXT record to inform receiving server what to do in case they received a spoofed email under your domain name. There's nothing Mailbox.org can do with DMARC.
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