This script builds dovecot with support for SSL. As such, you must have openssl installed - openssl-solibs is not enough in itself to meet this requirement. Additionally, dovecot will be compiled with POP3 support. You should create a dovecot user to run the login processes on your server. Something like this should work: [root@host] # groupadd -g 202 dovecot [root@host] # useradd -d /dev/null -s /bin/false -u 202 -g 202 dovecot From the dovecot-new release posting comes this word of advice: Remember to read http://wiki2.dovecot.org/Upgrading/2.0 before upgrading from v1.x. Although there is automatic config conversion, it can't handle everything, so reserve some extra time for upgrading. See the documentation in /usr/doc/dovecot-*/ to get started.