I posted a question on the sendmail list and everyone (so far)
pointed me to procmail as a solution, so, here I am.
What I'd like to do is restrict the message size on a per user
basis. Sendmail has a MAXSIZE option in its .cf file, however that
applies to the entire domain (or domains) it's servicing. What I need
is for it to work on a per user basis so that I can allow some users to
receive large files, and others not.
Someone on the sendmail newsgroup suggested this:
# Reject files larger than 1Mb:
:0
*> 1000000
*! ^X-Loop: user(_at_)domain(_dot_)com|^From:
valid(_dot_)user(_at_)domain(_dot_)com
{
:0 c
| (formail -r -I"X-Priority: 1 (Highest)" \
-A"X-Loop: user(_at_)domain(_dot_)com" ; \
echo "|||||||||| THIS IS AN AUTOMATED REPLY ||||||||||" ; \
echo "" ; \
echo "Sorry, but I don't accept email attachments >1MB without" ;
\
echo "prior warning. Your mail has therefore been deleted and" ; \
echo "I have NOT received it." ; \
echo "" ; \
echo "If you want to send me a large file, ask me first, telling"
; \
echo "me what it is and why I need it. I'll then add you to my" ;
\
echo "accepted senders list if it sounds worthwhile." ; \
echo "" ; \
echo "Thanks." \
) | $SENDMAIL -oi -t
:0
/dev/null
}
The problem with this is, I'd have to create it for each and every
user and nothing is going to stop them from removing that file. Ideally
I'd want:
- a site-wide (machine wide) recipe
- have it check a flat file for users, with their size restriction
(I'm guessing something like: DEFAULT_LIMIT 75000
userA 1000000
userB 150000
userF 999999999)
- if the msg received, is larger than the user's allowed size:
+ send a reply to the sender, saying their msg got pitched
+ pipe the msg to /dev/null
+ tell the recipient...not a damned thing
- and if the msg received falls within their restriction, pass it on
like nothing ever happened.
Is this even doable? Is the flat file idea sane?
--
W | I haven't lost my mind; it's backed up on tape somewhere.
+--------------------------------------------------------------------
Ashley M. Kirchner <mailto:ashley(_at_)pcraft(_dot_)com> . 303.442.6410
x130
IT Director / SysAdmin / WebSmith . 800.441.3873 x130
Photo Craft Laboratories, Inc. . 3550 Arapahoe Ave. #6
http://www.pcraft.com ..... . . . Boulder, CO 80303, U.S.A.
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