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Email Statistics and Trends

Unlock The Inbox tests thousands of emails a day and gathers statistical data to show trends in email authentication. Below are email statistics gathered from our Email Authentication Tester.



DKIM Statistics (View Historical)
MonthYearFoundPassedRestricted Headers SignedIdentifier Alignment
StrictRelaxedUnaligned
June201771%87%1%92%1%8%
May201753%85%2%86%1%13%
April2017107%59%0%93%0%7%
March201771%82%0%90%0%10%
February201765%85%1%87%1%12%


DKIM Key Sizes Used (View Historical)
MonthYear512 Bits768 Bits1024 Bits2048 Bits4096 BitsOther
June20170%0%40%56%0%0%
May20170%0%63%29%0%0%
April20170%0%89%8%0%0%
March20170%0%68%25%0%0%
February20170%0%61%31%1%0%


SPF and Sender ID Statistics (View Historical)
MonthYearFoundPassedSPFSender IDIdentifier Alignment
Type 16Type 99Type 16Type 99StrictRelaxedUnaligned
June201755%75%95%8%1%0%56%4%40%
May201777%72%96%7%2%0%80%4%16%
April201778%89%98%6%51%0%78%3%19%
March201783%86%97%7%22%0%86%5%10%
February201785%83%96%8%9%0%81%3%16%


DMARC Statistics (View Historical)
MonthYearFoundPassedDMARC Tests
ADKIMASPFRAURUFRecord Syntax
June201759%91%87%44%95%96%98%
May201741%82%73%82%90%91%94%
April201738%92%87%92%96%97%99%
March201750%90%80%92%93%94%98%
February201749%90%80%90%93%94%98%


Email Port Statistics - Part 1 (View Historical)
MonthYearPort 25 (SMTP)Port 110 (POP3)Port 143 (IMAP)
UsedSSLUsedSSLUsedSSL
FoundValidFoundValidFoundValid
June201783%69%44%19%16%5%19%19%7%
May201784%68%47%18%15%5%17%17%6%
April201791%77%63%15%12%4%13%13%4%
March201792%75%55%21%16%6%18%18%7%
February201786%70%49%16%12%4%14%14%5%


Email Port Statistics - Part 2 (View Historical)
MonthYearPort 465 (SMTP SSL)Port 993 (IMAP SSL)Port 995 (POP3 SSL)
UsedSSLUsedSSLUsedSSL
FoundValidFoundValidFoundValid
June201717%17%6%18%18%7%16%17%5%
May201716%16%7%18%18%8%15%16%6%
April201738%38%32%13%13%5%12%39%5%
March201722%22%10%19%19%7%17%22%6%
February201716%16%5%16%16%6%13%16%5%


SSL Key Sizes Used (View Historical)
MonthYear512 Bits768 Bits1024 Bits2048 Bytes4096 BitsOther
June20170%0%10%81%9%0%
May20170%0%8%85%7%0%
April20170%0%8%74%6%0%
March20170%0%11%79%8%0%
February20170%0%7%82%9%0%


Other Email Tests (View Historical)
MonthYearrDNS PassedPostmaster Address ExistsAbuse Address ExistsADSP Record Syntax Passed
June20170%93%89%6%
May20170%91%85%8%
April20170%94%91%4%
March20170%89%83%6%
February20170%89%81%12%


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