v5.2.1

• release: "Wed, 12 Mar 2025 06:50:22 +0900 (JST)"
• version: "5.2.1"
• changes:
  • Bug fix: substr outsite of string and Use of uninitialized value errors at find() method in Sisimai::SMTP::Status. #574 #575 Thanks to @ViktorNacht
  • Implement Sisimai::Rhost::Cloudflare #534 #578
  • #573 NTT DOCOMO (Major Japanese mobile carrier) no longer returns a bounce mail due to domain rejection or similar email settings, but instead were being delivered to the spam folder after March 13th. #576