Maximum Message Size, how do rules work?

[Jason Voorhees]

Hi people:

I'm using MailScanner 4.79.11 on RHEL 5.4 x86_64 with a setting like this:

Maximum Message Size = %rules-dir%/max.message.size.rules
Maximum Attachment Size = -1

My max.message.size.rules look like this:

From: user1 at domain.com 1M
From: user2 at domain.com 2M
From: user3 at domain.com 4M
From: *@domain.com 512K
To: *@domain.com 2M
FromOrTo: default 0

According to this I'm having some issues with rules not working as
expected so I have some questions:

1. "Maximum Message Size" evals the size of a whole message including
all its attachments, right?.

2. If I have "Maximum Mesage Size" and "Maximum Attachment Size"
configured as shown above, what should be the behavior among those two
directives? Is "Maximum Message Size" which dictates the control of
size of messages? Or are those rules ignored because of the unlimited
value (-1) of "Maximum Attachment Size"? Or maybe "Maximum Attachment
Size" is just ignored?

3. Rules of max.message.size.rules are evaluated like Firewall rules
or Squid ACLs? I mean, i want to know if MailScanner matches a message
with a rule (From: user1 at domain.com 1M) at line 3 then MS stop reading
next lines? Does MS always read all lines and matches with the last
rule found/matching?

I'm asking this because I noted that MS isn't working properly:

1. user1 at domain.com sends a message to user7 at domain.com (not in rules
file, so defaults to *@domain.com 2M) of 1.8 MB and MS doesn't block
it, it just let it pass. Didn't work as expected.
2. user1 at domain.com sends a message to user7 at domain.com (not in rules
file, so defaults to *@domain.com 2M) of 4.5 MB and MS doesn't block
it, it just let it pass. Didn't work as expected.
3. user1 at domain.com sends a message to user7 at domain.com (not in rules
file, so defaults to *@domain.com 2M) of 1.9 MB and MS does block it
and send a warning message as expected.

I just found a person on Internet with a similar problem with MS
4.79.11 and according to him the solution was to downgrade to MS 4.72.
The link of this report (sorry, is in spanish) is:

http://www.ecualug.org/2010/06/02/forums/problema_con_mailscanner_en_parametro_maxmessagesizerules

Is any bug related to this settings in MS 4.79.11? I checked the
Changelog of MS 4.81 (beta and stable) but didn't find anything
related to this.

I hope someone can help me because I don't really know what's the
problem with my MS installation.

Thanks