EllisLab/CodeIgniter — pull request #2480 by florisluiten (2013-06-07 14:22:18+00:00)
Title: Prevent email header injection

When a header is set, newline characters are stripped so one cannot inject his/her own email header(s). Since set_header is only used to set one header at a time, it should have no effect on any code relying on this function