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.