When registering for TWiki, the user is asked for his email address. If the user enters an invalid email address, (i.e. username without @domain) sendmail returns an error and this error is printed on stdout, thus mangling the HTTP Header.

Apache detects this malformed header and returns an "internal server error".

TWiki.Version: Dec 2000

-- DanielKabs - 06 Mar 2001

Closed as this relates to a very old version of TWiki, and appears to be fixed by the SkipBad option of Net::SMTP.

-- RichardDonkin - 17 Oct 2002

This bug has been re-opened, since it's still happening in my install of the lattest production TWiki (01 Dec 2001). I followed the poster's instructions, and the error happened just as was described.

-- DavidRoche - 10 Dec 2002

Now fixed in TWikiAlphaRelease - register validates the email address. Thanks for re-opening this.

-- RichardDonkin - 10 Dec 2002

I made a small change to the e-mail validation regex, the alias part accepts now also undersocres.

$emailAddrRegex = qr/([A-Za-z0-9\.\+\-\_]+\@[A-Za-z0-9\.\-]+)/;

Let me know in case you know of any other legal characters for e-mail.

-- PeterThoeny - 11 Dec 2002