Exim config: What's the difference (by score) between ACL and Filters

[Kent Brockman]

Hi, when you go to the Exim configuration Editor, you'll see two score based settings. One at ACL Options and one more at Filters section.
What's the difference between one and another? Using both, are you forcing the scripts to do a useless double work? or may this have some useful use? You'd say it is safge to use only one of these methods? if so, which one?

ACL Options

SpamAssassinTM: Reject mail with a spam score greater than 10 at SMTP time. [?]
Reject mail at SMTP time if the spam score from SpamAssassinTM is greater than 10 .

SpamAssassinTM: Reject mail with a spam score greater than 12.5 at SMTP time. [?]
Reject mail at SMTP time if the spam score from SpamAssassinTM is greater than 12.5 .

SpamAssassinTM: Reject mail with a spam score greater than 15 at SMTP time. [?]
Reject mail at SMTP time if the spam score from SpamAssassinTM is greater than 15 .

SpamAssassinTM: Reject mail with a spam score greater than 17.5 at SMTP time. [?]
Reject mail at SMTP time if the spam score from SpamAssassinTM is greater than 17.5 .

SpamAssassinTM: Reject mail with a spam score greater than 20 at SMTP time. [?]
Reject mail at SMTP time if the spam score from SpamAssassinTM is greater than 20 .

Filters

SpamAssassinTM: Bounce mail when the spam score is greater than 10 [?]
SpamAssassinTM: Reject mail with a bounce message (not at SMTP time) when the spam score is greater than 10 .

SpamAssassinTM: Bounce mail when the spam score is greater than 12.5 [?]
SpamAssassinTM: Reject mail with a bounce message (not at SMTP time) when the spam score is greater than 12.5 .

SpamAssassinTM: Bounce mail when the spam score is greater than 15 [?]
SpamAssassinTM: Reject mail with a bounce message (not at SMTP time) when the spam score is greater than 15 .

SpamAssassinTM: Bounce mail when the spam score is greater than 17.5 [?]
SpamAssassinTM: Reject mail with a bounce message (not at SMTP time) when the spam score is greater than 17.5 .

SpamAssassinTM: Bounce mail when the spam score is greater than 20 [?]
SpamAssassinTM: Reject mail with a bounce message (not at SMTP time) when the spam score is greater than 20 .

Thanks