Version 5.2.21 (December 28th 2016)

• Fix missed number update in version file - no functional changes

Version 5.2.20 (December 28th 2016)

• SECURITY Critical security update for CVE-2016-10045 please update now! Thanks to Dawid Golunski and Paul Buonopane (Zenexer).

Version 5.2.19 (December 26th 2016)

• Minor cleanup

Version 5.2.18 (December 24th 2016)

• SECURITY Critical security update for CVE-2016-10033 please update now! Thanks to Dawid Golunski.
• Add ability to extract the SMTP transaction ID from some common SMTP success messages
• Minor documentation tweaks

Version 5.2.17 (December 9th 2016)

• This is officially the last feature release of 5.2. Security fixes only from now on; use PHPMailer 6.0!
• Allow DKIM private key to be provided as a string
• Provide mechanism to allow overriding of boundary and message ID creation
• Improve Brazilian Portuguese, Spanish, Swedish, Romanian, and German translations
• PHP 7.1 support for Travis-CI
• Fix some language codes
• Add security notices
• Improve DKIM compatibility in older PHP versions
• Improve trapping and capture of SMTP connection errors
• Improve passthrough of error levels for debug output
• PHPDoc cleanup