You can do limit SMTP session limit as well using IPTABLES.... Add below command in your IPTBALES /etc/sysconf/iptables
-A INPUT -i eth0 -p tcp -m tcp --dport 25 -m limit --limit 20/min -j ACCEPT This will limit users to 20 sessions per min... Regards Jawad -----Original Message----- From: Jean-Paul natola [mailto:[email protected]] Sent: Wednesday, March 31, 2010 7:18 PM To: [email protected] Subject: [exim] 421 Too many concurrent SMTP connections; please try again later. Hi all, I'm hopin someone can help out here , people have been complaining over the last week that they cant send us email this is what they are recieng 421 Too many concurrent SMTP connections; please try again later. I'm getting TONS of these bounces, and these are users that have always sent to us TIA _________________________________________________________________ Hotmail is redefining busy with tools for the New Busy. Get more from your inbox. http://www.windowslive.com/campaign/thenewbusy?ocid=PID27925::T:WLMTAGL:ON:WL:en-US:WM_HMP:032010_2 -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
