I agree that i worry about getting labeled as spam with daily mailings. would be nice to atleast have the "click here to unsubscribe" and goes to their control panel/my home. would be a nice kind of script..
so yea on 'a'
b might be okay, but would be somewhat of an annoyance too, and slightly more programming work.
and c, i dunno if it's possible to do without having threads integrated somehow with the email server. maybe with some script to check email on the next cron scheduled send, but it could get messy, differnt mail servers having differnt responses, and maybe like telling the differnce between "message delayed" vs "message refused" etc.. could all get very complicated.. but i will say that 'a.' would be a nice feature
