SPF lists which servers may send mail for your domain. DKIM signs messages cryptographically. DMARC tells receivers how to treat failures — monitoring first, then enforcement.
HostStack cannot guarantee inbox placement for bulk mail (no provider honestly can), but aligning these records sharply reduces “looks forged” scoring when you send from HostStack-hosted mailboxes or approved relays.
Publish incremental TXT records and validate with external SPF/DKIM/DMARC checkers before switching DMARC to strict modes.