Using Jespers howto, spamassasin works fine until I add a RBL under: Global Real Time Black/Block List(RBL) Configuration.
If any address is added, im not able to send mail anymore from webmail. Error: [imp] unable to add recipient [xxxx@nxxx.com]: 451 postmaster@localhost [on line 918 of "/home/httpd/html/horde/imp/compose.php"]
Removing the address and restarting SPA, then it works again..
any suggestions?