-snip- i know that there is a limitation for sending messages in the forum setup. Does the bot accout have special powers authorized by admin or the increase of the number of subscribers may negatively affect the function of the bot?
Yes, the bot account restrictions for sending messages have been lifted as stated by Piggy in the following post:
-snip- we are moving from Thread to PM, since the PM limitations for Maggiordomo have been lifted. -snip-
what if my username have been quoted in a reply quoted in another reply which have been quoted n another reply... should i still receive notifications?
As far as I know, you will get the notification. Unless you quote your post.