[SLE] email accounts without shell access

Hi, Does anyone know what software is being used by ISP's to give addtional email accounts, without shell access? You get 1 login account, but can obtain additional email addresses usually free or for a small fee. What software do they use on the server-side? Thanks -- To unsubscribe send e-mail to suse-linux-e-unsubscribe@suse.com For additional commands send e-mail to suse-linux-e-help@suse.com Also check the FAQ at http://www.suse.com/support/faq