When using the fEmail class to send e-mails, certain from and to e-mail address combinations produce an error. It seems to have something to do with the $headers variable in the mail() function. When I remove this variable in line 1467, the error is gone.
From the few different addresses I have tested, the error occurs with a combination of a to- and from e-mail address that both share our own domain (hoverkraft.nl), and a combination of hoverkraft.nl and gmail.com.
Any ideas on what causes this?
Oh, and by the way: I think Flourish is great!