Postmaster information
Reference data for receivers, abuse desks, blocklist operators validating Greelz mail.
Outbound egress
- TCP 25 egress IP: 103.228.169.32 (canonical PTR: mail.greelz.com.) — aligns with SMTP HELO/source host.
- Feedback-ID header present on programmatic mail for Google Postmaster correlation.
SPF (_spf/@)
Published SPF for greelz.com includes authorised IPv4 egress. Verify TXT at apex—do not whitelist solely on anecdotal SPF if DMARC aligns.
DKIM
- Selector (typical outbound): s1._domainkey.mail.greelz.com (TXT record anchored at signing subdomain).
- RSA-SHA256 with relaxed canon on selected headers incl. Feedback-ID.
DMARC
Observe published _dmarc.greelz.com TXT (policy aligns with phased enforcement). Aggregate reports routed per RUA therein.
High-volume acceptance requires alignment with Mailbox Provider Guidance (SPF/DKIM/DMARC, valid List-Unsubscribe, reachable abuse).