To get Mailcatcher (http://mailcatcher.me/) running under PuPHPet-based Vagrant (http://puphpet.com) I had to implement the following shell script in puphpet/files/startup-always/correct_mail_catcher.sh:
sed -i "s/^sendmail_path=\/usr\/local\/rvm\/wrappers\/default\/catchmail -f$/sendmail_path=\/usr\/local\/rvm\/wrappers\/default\/catchmail -f email@example.com/g" /etc/php.d/zzzz_custom.ini
echo "SET sendmail_path"
The script adds a value to the -f param and that fixes the issue, that no mails are collected by mailcatcher. Versions: Vagrant: 1.6.2 Puppet: 3.4.3 OS: CentOS 6.5 (Final) / Debian 3.2.65-1 / Ubuntu 12.04