Postmaster

This page is for ISPs, mail server operators, anti-abuse organizations, and deliverability researchers. Customers should see /contact.

Contact

postmaster@mailmundo.com — operational issues, deliverability questions.
abuse@mailmundo.com — abuse reports.
Response time: 24 hours on business days, 48 hours on weekends.

Sending policies

• SPF, DKIM, and DMARC required on all sending domains.
• Custom MAIL FROM aligned with the sending domain.
• MTA-STS enforce mode.
• TLS-RPT publishing enabled.
• Suppression on hard bounce and complaint, immediate and permanent.
• Engagement-based sunset (90-day inactivity) on marketing streams.
• Frequency capping per recipient.
• Stream separation (transactional vs marketing) at the configuration set and IP level.

Authentication

Sending domains use SPF, DKIM (rotated every 90 days), DMARC, and ARC on forwarded messages. We honor MTA-STS and TLS-RPT.

Reporting

DMARC aggregate reports go to dmarc@mailmundo.com. Failure reports may also be sent there. We parse and act on these in our DMARC aggregator.

Block-list inquiries

If our sending IP appears on your block-list, please email postmaster@mailmundo.com with: the IP, the listing reason, the time window, and a sample message-id if available. We will investigate and respond within 24 hours on business days.

Customer enforcement

We act on legitimate abuse reports against customer accounts. Repeat violators are suspended or terminated. We log enforcement actions in an immutable audit trail.

Data we provide on request

For valid law-enforcement requests with proper legal process, we provide data we are legally obligated to share. We do not pre-comply and we challenge overbroad requests.