Can you have multiple DMARC records?

• Myth: Having multiple DMARC records provides redundancy.
• Reality: Multiple DMARC records cause processing errors.

DMARC specification:

• Only one TXT record at _dmarc.domain
• Multiple records may cause unpredictable behavior
• Some receivers take first, some fail

Common mistakes:

• Adding new DMARC instead of editing existing
• Copy-paste errors creating duplicates
• Migration leaving old record

Verification:

• dig TXT _dmarc.yourdomain.com
• Should return exactly one DMARC record
• Edit existing record rather than adding new ones.

One policy document per domain. Duplicates cause confusion and processing failure.