On 9/9/05, Mike Skimin <webmaster@xxxxxxxxxxxxxxxx
<mailto:webmaster@xxxxxxxxxxxxxxxx>> wrote:
Hello,
I have a client who is on a VPS(1)B server, they recently moved
and are
now connect through a local college's network. They are now unable to
send messages to more than 8 people at a time. Other clients on the
server are not having the problem. The college's tech team tells me
they have updated their Firewall to allow this client to access
port 25
on our server. Their tech people believe it is our issue, I don't
think
it is because no other clients are having the problem.
Anyone know of a way to solve this issue?
By any chance does your sendmail macro configuration file have a line
like:
define(`confMAX_RCPTS_PER_MESSAGE', `8')
If it does, that would *definitely* cause the behavior you describe.
(Unfortunately, sendmail doesn't descriminate between wannabee
spammers that connect to your server to carry out a dictionary attack
and legitimate clients who want to use your server as the outgoing
SMTP server.0
I can't imagine the client's
computers are limiting the number of messages, and I want to
believe the
tech team but I am at a loss as to what might be happening. I
looked at
the sendmail.cf <http://sendmail.cf> file and do not see any
limiting information.
The corresponding line in the sendmail.cf <http://sendmail.cf> would be
O MaxRecipientsPerMessage=8
Any ideas would greatly be appreciated.
I'll think on it ...
(P.S. Do you implement any of the techniques mentioned at
http://technoids.org/dossed.html? Depending on the number of external
IP addresses at the college, if several clients simultaneously use
your VPS as their outgoing SMTP server, it is possible that all of
them could look like they are coming from the same IP address, and
sendmail might be limiting them someway ... Just a thought.)
--
Bennett Lanford <benlanford@xxxxxxxxx <mailto:benlanford@xxxxxxxxx>>
There are 10 kinds of people: those that understand binary and those
that don't.