Le 15/12/2012 14:43, Ram a écrit : > Hi > > I have a slightly OT question > > If I have to use a single IP for a sender domain to the internet, but > yet the mails may get sent from different servers > What is the best way for doing it > > The requirement is because the volumes are too large for a single > machine to handle but the client still wants to send the mails using a > dedicated IP
if the servers perform heavy tasks such as malware and spam filtering, then dedicate one box to mail routing and use it as a gateway from which all mail will get out. if even mail routing is too heavy, then as said, NAT may help (whether on a hard box or on a server with BSD+pf or Linux+iptables), provided one box can route as much traffic! Note1. with 1 IP, you get less than 2@16 ports, which gives a hard upper limit on the number of simultaneous TCP connections. Note2. if you need a lot of bandwidth, then the box that sends mail as well as all other nodes in the path need to be able to handle this.
