Hi, what are the following messages supposed to tell me and does this indicate a problem? # systemctl status cyrus-imapd [...] master[3766]: unable to setsocketopt(IP_TOS): Operation not supported master[3766]: unable to setsocketopt(IP_TOS): Operation not supported [...] Exim says it can not connect to the lmtp socket even when selinux doesn´t get in the way. The configuration looks like this: cyrus.conf (none of the two options work): [...] # lmtp cmd="lmtpd -a" listen="lmtp:127.0.0.1" prefork=4 lmtpunix cmd="lmtpd -a" listen="/var/lib/imap/socket/lmtp" prefork=4 [...] exim.conf: [...] begin transports # cyrus_ltcp: # driver = smtp # protocol = lmtp # delivery_date_add # envelope_to_add # return_path_add # hosts = localhost # allow_localhost lmtp_socket: driver = lmtp socket = /var/lib/imap/socket/lmtp delivery_date_add envelope_to_add return_path_add # ls -la /var/lib/imap/socket/lmtp srwxrwxrwx. 1 root root 0 Mar 16 12:58 /var/lib/imap/socket/lmtp I have this working on the old server (which doesn´t run Centos) and am trying to migrate it to the new one (which runs Centos 7.4). The version of cyrus and sasl are the same on both machines. What´s the problem with Centos that these things don´t just work as they usually do?