Sisimai: Mail Analyzing Interface

Release Notes

Sisimai 4.25.17

2025/03/12

Sisimai 4.25.17 is now available. This release focuses on resolving an issue with emails sent to NTT DOCOMO (Major Japanese mobile carrier) after March 13, where they were being rejected or bounced due to domain restrictions or specified reception settings. Now, these emails will be delivered to the spam folder .

Sisimai 4 series is now in a state where it only receives fixes for critical bugs that cause overall crashes and updates to accommodate major service changes. Therefore, we recommend upgrading to Sisimai 5 series, which addresses modern delivery errors such as domain authentication and reputation.

And then, Sisimai 5 includes many changes that are not compatible with Version 4, so please check the Perl or Ruby version of your environment before installing or upgrading.

Changes

  • If the bounce email from NTT DOCOMO contains the error message 550 Unknown user, the only bounce reason detected will be User Unknown. #577 #335
  • Perl Tiny code improvement on Sisimai::Lhost::EinsUndEins to parse bounce emails in slightly different formats. #497
  • Ruby Merge #260 fix for parsing a bounce mail from an EWS Server with a new line code (CR) in Sisimai::Message class. Thanks to @nick4tech #260