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I want to loadbalance outbound emails via multiple IPs, is there any built-in tool or some easy way to do it with postfix, sendmail or exim? for example if I assign three IPs to the email server and emails are sent via all the ips one by one.

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If you want send mails from different Ip's from a single mail server than you should think about postfix multiple instance on a single host. And you can assign a different Ip address for each instance and your null instance will submit mails for each instance. for more detail you may refer these links This one for how to assign Ip and all http://souptonuts.sourceforge.net/postfix_sbr.html and this for all basic information how we create and how instance works http://www.postfix.org/MULTI_INSTANCE_README.html

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the references are good, actually I am using that technique so we can setup bulk email server and do not get blocked our IP. is this some good solution you think? –  Toqeer Sep 11 '12 at 5:41
    
If you want to prevent your Ip from blacklisting than you should use subscribed mailling lists and if you want to hide your Ip than you are categorised as spamer. –  user128296 Sep 11 '12 at 6:06
    
one or other way our users are subscribed to the list but that are huge in numbers so I am just scared that our IP does not block, what about mailchimp, if some of their clients send emails which are unsolicted would their IPs get blocked? what mechanism they use to send emails? –  Toqeer Sep 11 '12 at 8:49
    
you should go mailchimp terms and conditions. they block the user if user sends mail more than one mail per 1000 as spam. –  user128296 Sep 11 '12 at 9:21

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