My suggestion is to drop all invalid addresses, since that is a signal that these addresses are meant only for human consumption.

My suggestion would be not to harvest email addresses from web pages at all as people should be entitled to put email addresses on a web page without worrying about being attacked by spammers.

If you want to get email addresses then ask visitors to your website to register - but allow them to opt out of spamming.

--
<http://www.dave.org.uk>

"Perl makes the fun jobs fun
and the boring jobs bearable" - me