# smtp_active_hostname need_ipv4 # exim -bh 1.2.3.4 -oMi V4NET.0.0.1 helo a.b.c quit **** exim -bh 1.2.3.4 -oMi V4NET.0.0.2 helo a.b.c quit **** 1 exim -bh 1.2.3.4 -oMi V4NET.0.0.3 helo a.b.c quit **** exim -bh 1.2.3.4 -oMi V4NET.0.0.4 helo a.b.c quit **** exim -DSERVER=server -DIP1=127.0.0.1 -DIP2=HOSTIPV4 -bd -oX PORT_D **** client 127.0.0.1 PORT_D ??? 220 helo foobar ??? 250 mail from:<> ??? 250 rcpt to: ??? 250 data ??? 354 . ??? 250 quit ??? 221 **** # Wait for it to be delivered sleep 1 client HOSTIPV4 PORT_D ??? 220 helo foobar ??? 250 quit ??? 221 **** killdaemon no_msglog_check