Aweber is good for managing email lists - you have to pay around $20 per month for an account. The only problem is sometimes broadcast emails sent to your list from aweber don't go out on time -so beware if you have a time sensitiv promotion.

Infusionsoft is now the big one which has a lot more functions than aweber - i.e for splitting lists etc. - but it's more expensive.

Your mailing list is your KEY asset - build rapport and nurture your list. Never join up different unrelated lists as effectively you will be spamming some subscribers if you send them an email some are not interested in.

Instead send out specific well crafted content to your lists. DON'T just send out promotions - they want good quality free content such as a weekly newsletter. then when you do occasionally promote your list will be responsive.