Mail Deliverability Test
Assess core deliverability signals for your domain and prioritize the next steps for better inbox placement.
Guide & best practices
Mail Deliverability Test
Assess core deliverability signals for your domain and prioritize the next steps for better inbox placement.
What affects deliverability?
Deliverability depends on DNS setup, authentication, reputation, reverse DNS, blacklists, SMTP reachability and transport security.
Blacklist check
DNSBLs and reputation lists show whether a domain or sending IP has been flagged.
SMTP & STARTTLS
SMTP connectivity verifies reachability; STARTTLS indicates whether transport encryption is offered.
Understanding the deliverability score
The score combines MX, SPF, DKIM, DMARC, PTR, blacklist and SMTP/STARTTLS signals.
Frequently asked questions
Why do my emails land in spam?
Common reasons include broken SPF/DKIM/DMARC, poor IP reputation, blacklist hits, missing reverse DNS, suspicious content or sudden volume spikes.
What is a PTR/rDNS record?
A PTR record maps an IP address back to a hostname. Mail servers should have meaningful reverse DNS.
How do I get removed from a blacklist?
Fix the root cause first, then request delisting from the specific DNSBL operator.
What is MTA-STS?
MTA-STS lets domains publish a policy that encourages or enforces encrypted SMTP transport.
What is a TLS-RPT record for?
TLS-RPT (SMTP TLS Reporting) is a TXT record at _smtp._tls.your-domain with v=TLSRPTv1; rua=mailto:tls-reports@your-domain. It ensures you receive reports about failed or successful TLS connections (e.g. with MTA-STS or DANE) so you can spot delivery problems early.
What is a BIMI record and which parameters matter?
BIMI (Brand Indicators for Message Identification) is a TXT record at default._bimi.your-domain with v=BIMI1; l=https://.../logo.svg; a=https://.../vmc.pem. The l= parameter points to the brand logo (SVG Tiny PS), a= optionally to a Verified Mark Certificate (VMC). An enforced DMARC policy (quarantine or reject) is a prerequisite.