Issues with multiple emails sent

Hi all,

We'd like to run a kind of email reporting at our site - sending daily/monthly information to our members. And I'd like to ask if there're any issues or problems we could encounter in terms of bandwidth usage and CPU time consumed by sending these emails or some advices what to do and not to do..

Have anybody dealt with something like that and could share his/her experiences?

Thanks all for any replies...
Martin