[rt-users] malformed outgoing email address ?

[Phil Homewood]

Brian McClendon wrote:
> > 501 5.1.3 'AdminCc of AlchemyRT Ticket #159':;... List:;
> > syntax illegal for recipient addresses

You are using Sendmail[tm] brand sendmail and have not
followed the instructions regarding UseFriendlyToLine
in config.pm, at a guess.