They do, but rate limiting on IPtables if I remember works at the nat level so you will need to make the linux box a router where you do the rate limiting, if you use IPtables. OpenBSD's dummynet features work a lot better for this type of rate limiting.
> -----Original Message----- > From: Toni Mueller [mailto:[EMAIL PROTECTED] > Sent: Monday, September 04, 2006 1:48 PM > To: [email protected] > Subject: Re: SPAM Control and qmail-ldap proxy. > > > Hello, > > On Sat, 26.08.2006 at 13:03:32 +0530, Ajay Nawani > <[EMAIL PROTECTED]> wrote: > > My domain: hello.com with MX record mx1.hello.com > > > > I'm having three servers as below: > > > > Server1: > > Name: mx1.hello.com > > Platform: Redhat Linux with Qmail. > > Acting as: Inbound SMTP server for hello.com domain (MX pointer) and > forward > > to pop.hello.com server. > > > > Server2: > > Name: pop.hello.com > > Platform: Solaris, Qmail-LDAP, Courier-IMAP > > Acting as: POP3, IMAP Server. > > > > Server3: > > Name: smtp.hello.com > > Platform: Redhat Linux with Qmail. > > Acting as: Outbound SMTP Server. > > the easiest way to get mx1 to check for valid recipients is to upgrade > from Qmail to Qmail-LDAP and point it to the same directory as pop. > > As for rate limiting, I use the standard features of OpenBSD, but > iptables might have something similar (I didn't investigate). > > > Best, > --Toni++ >
