v5.0.3

• release: "Wed, 22 May 2024 14:12:22 +0900 (JST)"
• version: "5.0.3"
• changes:
  • Remove .travis.yml from this repository
  • Follow updates in Gmail SMTP errors and codes on Apr 29 and May 10 at Sisimai::Rhost::Google
    #275 #277 #283
    • https://support.google.com/a/answer/3726730?hl=en
    • azumakuniyuki/feb-2024-no-auth-no-entry@1d6adede
    • azumakuniyuki/feb-2024-no-auth-no-entry@d477b178
    • Implement SMTP error codes as follows: 4.7.23, 4.7.30, 4.7.32, 5.7.29, and 5.7.30
    • Shortened error message patterns to make them more adaptable to minor sentence changes.
  • Multibyte characters in the code and comments have been replaced with ASCII characters #278
  • #279 #280 Deal the Apple unsubscribe notification as an ARF message. Thanks to @mnmallea
  • Add the following error message patterns returned from Exchange Online #281
    • 4.4.317, 5.4.317: STARTTLS is required to send mail
    • 4.4.318, 5.4.318: Connection was closed abruptly (SuspiciousRemoteServerError)
  • #282 Added 16 error message patterns into the following reasons:
    • Blocked
    • Expired
    • Filtered
    • MailboxFull
    • NoRelaying
    • Suspend
    • UserUnknown
  • #286 Use Codecov for the coverage