A conservative DMARC deployment cycle would resemble:
| TXT Record Value | |
| 1. Monitor all | “v=DMARC1; p=none; rua=mailto:postmaster@your_domain.com” |
| 2. Quarantine 1% | “v=DMARC1; p=quarantine; pct=1; rua=mailto:postmaster@your_domain.com” |
| 3. Quarantine 5% | “v=DMARC1; p=quarantine; pct=5; rua=mailto:postmaster@your_domain.com” |
| 4. Quarantine 10% | “v=DMARC1; p=quarantine; pct=10; rua=mailto:postmaster@your_domain.com” |
| 5. Quarantine 25% | “v=DMARC1; p=quarantine; pct=25; rua=mailto:postmaster@your_domain.com” |
| 6. Quarantine 50% | “v=DMARC1; p=quarantine; pct=50; rua=mailto:postmaster@your_domain.com” |
| 7. Quarantine all | “v=DMARC1; p=quarantine; rua=mailto:postmaster@your_domain.com” |
| 8. Reject 1% | “v=DMARC1; p=reject; pct=1; rua=mailto:postmaster@your_domain.com” |
| 9. Reject 5% | “v=DMARC1; p=reject; pct=5; rua=mailto:postmaster@your_domain.com” |
| 10. Reject 10% | “v=DMARC1; p=reject; pct=10; rua=mailto:postmaster@your_domain.com” |
| 11. Reject 25% | “v=DMARC1; p=reject; pct=25; rua=mailto:postmaster@your_domain.com” |
| 12. Reject 50% | “v=DMARC1; p=reject; pct=50; rua=mailto:postmaster@your_domain.com” |
| 13. Reject all | “v=DMARC1; p=reject; rua=mailto:postmaster@your_domain.com” |
Remember to view the daily reports.
Additional information:
DMARC & Google Apps: https://scottontechnology.com/google-apps-dmarc-information/
DMARC Record Lookup
MXToolBox: http://mxtoolbox.com/dmarc.aspx