After installed Mailer plugin version 1.13. I can not sending email to individuals who broke the build.

See error:
ERROR: Unable to send to address: michal_jenicek@xx.cz,lubos_strapko@xx.cz
javax.mail.internet.AddressException: Illegal address in string ``michal_jenicek@xx.cz,lubos_strapko@xx.cz''
at javax.mail.internet.InternetAddress.<init>(InternetAddress.java:114)

Problem is probably that there is inserted a comma instead of a space.

After downgrading the old version 1.12 it works.

Thank you for your the fix
Petr Rocen