Free Diagnostic Tools
IT Tools
Email Deliverability
Why Is My Email Going to Junk?
Email lands in spam for specific, diagnosable reasons — a missing SPF record, failed DKIM signature, no DMARC policy, or a blacklisted IP. Use the Email Health Check to get a complete diagnosis in one click.
Individual Tools
MX Lookup
Find the mail servers responsible for accepting email for a domain, with priority order and IP addresses.
DNS Lookup
Look up any DNS record type — A, AAAA, CNAME, TXT, NS, SOA, MX, PTR — for any domain.
SPF Checker
Validate your SPF record, see all authorized sending IP ranges, and understand what your current policy means for deliverability.
DMARC Checker
Check your DMARC policy, alignment mode, reporting addresses, and get a plain-English explanation of what happens when emails fail authentication.
DKIM Lookup
Verify your DKIM public key record for a given selector. Confirms your email digital signatures are properly configured.
Blacklist Check
Check an IP address or domain against 20 major spam blacklists (RBLs). A blacklisted IP is one of the most common reasons email goes to junk.
Reverse DNS (PTR)
Look up the hostname associated with an IP address. A missing or mismatched PTR record can cause email to be rejected.
Why Email Ends Up in Junk — Explained
The sending server's IP isn't listed in the domain's SPF record. Gmail and Outlook see a mismatch and route it to junk.
The email's digital signature is missing or invalid. Without DKIM, spam filters have no cryptographic proof the email is legitimate.
If a domain has a DMARC policy of p=quarantine and your email fails SPF or DKIM alignment, it goes straight to junk.
Your mail server's IP is on a spam blacklist — often from a previous compromise or shared hosting. This is an instant junk trigger.
Your mail server's IP doesn't resolve back to a hostname (or resolves to the wrong one). Many spam filters reject mail from servers without a valid PTR record.
Certain words, link patterns, image-heavy layouts, or high unsubscribe rates train spam filters to route your email to junk over time.