No - it's not bad at all as long as you have some minimal understanding about what you are doing. Graylisting + Delayed SMTP prompt + Blacklists + Whitelists w

No - it's not bad at all as long as you have some minimal understanding about what you are doing. Graylisting + Delayed SMTP prompt + Blacklists + Whitelists works pretty well for filtering incoming spam. For outgoing mail you just need to make sure that you're not sending mail from a dialup IP range, or some other IP range included in common blacklists. It also helps to register on one of the more common whitelists that are available for free. And of course you need a valid reverse lookup - many mailservers don't accept mails from hosts without them.