My company has built a custom solution, by using the following and a bunch of custom coding ofc.
Ubuntu v. 10.04.2LTS
PostFix v.2.7.0
Apache v.2.2.14
BeansTalk v.1.4.6
PHP 5.3.2
MySQL v. 5.1.41
ProFTPg v.1.3.2C1
msmtp
cbpolicyd
Roadsend PHP 2.9
Perl CPAN Modul: Net::Server
Perl CPAN Modul: Net::CIDR
Perl CPAN Modul: Config::IniFiles
Perl CPAN Modul: Cache::FastMmap
It can scale to an infinite amount of servers (in theory lol). If you are enrolled in the MS JMRP program it will auto-remove people that flags the mails as spam. It will auto remove hardbounces pr. the parameter you set. It creates gold lists based on parameters set (for instance, all people that's clicked/opened a mail within the last 90 days).
And a lot more.
The interface is not awesome, not at all, stats are XML based so you can build whatever you want on it. But you can do split testing, send from multiple domains to multiple lists and other standard features.
But feel free to hit me up on ICQ if you want to talk more.
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