Thanks for the link.
What I mean is when I register a nick on my own irc server then anope should send a confirmation mail. But no mail is sent.
And I can see one reason the mail isn't sent. Not sure if that is the root of the problem but there is at least one bug.
Sendmail itself works fine, In a bash script I receive a test mail.
Anope tries to write the text of the mail to the file '/usr/sbin/sendmail'. That is a bug,