Alternatives to GlockApps
An online email deliverability tester that checks inbox placement, spam scores, blocklists and domain authentication. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
GlockApps
An online email deliverability tester that checks inbox placement, spam scores, blocklists and domain authentication.
Replacements
Listings that take over the same core job as GlockApps.
Mail Tester
A web tool that scores how likely an email is to be marked as spam.
Mail Tester scores a single email out of 10 for spam likelihood after you send it to a given address, with an API but no inbox placement across providers.
Maileroo Mail Tester
A free web tool that grades a test email for authentication, spam score, DNS and blacklists.
Maileroo Mail Tester is free and grades a real delivered message for authentication, spam score, DNS and blacklists, but runs only one test at a time.
MXToolbox
A web-based suite of DNS, MX, SPF, DMARC and blacklist lookups for diagnosing email delivery.
MXToolbox checks DNS, SPF, DMARC and 105 blacklists for a domain as separate lookups, without testing where a message lands across mail providers.
Also worth comparing
These listings name GlockApps as their own alternative, so the relationship runs both ways.
DKIM Validator
Web tool that checks DKIM, SPF and SpamAssassin results for a test email you send.
GlockApps adds inbox placement across major providers, blocklists and spam scores to SPF, DKIM and DMARC checks, with full seed tests on a paid plan.
EasyDMARC BIMI Lookup
Free online checker that retrieves a domain's BIMI record and validates its logo and VMC certificate.
GlockApps offers free standalone DNS record checkers including BIMI alongside paid inbox placement testing, though it does not mention validating the logo or VMC certificate.
EasyDMARC DKIM Lookup
A free web tool that looks up and validates a domain's DKIM record for a given selector.
GlockApps checks DKIM alongside SPF, DMARC, blocklists and spam score as part of a freemium deliverability tester, with full seed-list testing on a paid plan.
EasyDMARC DMARC Lookup
A free web tool that looks up a domain's DMARC record and checks it for configuration errors.
GlockApps checks DMARC together with SPF, DKIM, blocklists and spam score and shows inbox placement, with full seed-list testing requiring a paid plan.
Google Postmaster Tools
Google's web dashboard for checking a sending domain's reputation and mail deliverability to Gmail.
GlockApps tests inbox or spam placement across several major mail providers rather than Gmail alone, but full seed-list testing requires a paid plan.
Kitterman SPF Validator
Online SPF tools that retrieve and validate a domain's SPF record or test a draft record.
GlockApps checks SPF together with DKIM, DMARC, blocklists and inbox placement, with full seed-list testing requiring a paid plan.
MultiRBL
A free tool that checks a mail server IP against over 200 DNS blacklists and whitelists.
GlockApps checks blocklists alongside inbox placement, spam score and SPF, DKIM and DMARC, though full seed-list testing requires a paid plan.
MXToolbox Blacklist Check
An online tool that tests a mail server IP or domain against over 100 DNS blacklists.
GlockApps combines blocklist checks with inbox placement, spam scores and domain authentication, with full seed-list testing on a paid plan.
MXToolbox DKIM Lookup
A free web tool that tests whether a domain publishes a valid DKIM public key for a selector.
GlockApps checks DKIM together with SPF, DMARC, blocklists and inbox placement, aimed at bulk senders, with full testing on a paid plan.
Postmark Spam Check
A free web tool and JSON API that returns the SpamAssassin score of an email message.
GlockApps adds inbox placement across major providers to spam score, authentication and blocklist checks, with full seed-list testing on paid plans.
Similar software
Related functionality, not a direct replacement.
LearnDMARC
An interactive web console that visualizes how SPF, DKIM and DMARC evaluate a real email.
CheckTLS
A web tool that tests whether a recipient's mail server accepts secure TLS connections for email.
