Hello, If I understand correctly, the value of primary_hostname in the file /etc/exim/exim4u_local.conf.inc is used as outgoing IP address if MULTI_IP is NO in this file. After installing exim4u on a host with primary_hostname a FQDN, say FQDN1 that points to an ip address IP1 of this box everything worked fine. Now I changed this value to another FQDN, say FQDN2 that points to another ip address IP2 of this box. In the outgoing_ip field of the domains table in the MySQL database also IP2 appears. But when sending outgoing mails from the domains I configured in exim4u, IP1 is used for the SMTP connection. What am I doing wrong? In principle I want that outgoing connections are everytime made from IP2. Note that I use MULTI_IP = NO. Best, Udo