The SendEmail reactor for Action/Trigger has been updated to use the Email::MIME Perl module for proper encoding of the email message header fields. You should notice no functional difference in the sending of emails. This change does add a new prerequisite package, so be sure to run the prerequisite installation procedure for your Linux distribution before upgrading Evergreen.

The new dependency is the libemail-mime-perl package for Debian and Ubuntu, and the perl-Email-MIME package for Fedora.