Hi, I’ve been trying to setup postfix 3.4.6 (ghettoforge.org <http://ghettoforge.org/> package) with dovecot, mailscanner and the mailwatch frontend on a centos 7 (cloudlinux 7.6) server. Everything appears to work properly except that, when I setup smtp and lmtp as chrooted and try to send mail, a curious name resolution error happen. The exact error is as follow:
unable to look up host mx.planethoster.net: Device or resource busy This is particularly strange considering that to identify the MX of my domain, it was able to read its zone. Furthermore, if I su to the postfix user by giving it a login shell, I am able to dig the MX in question. So, I can resolve the MX when logged in as the user, but postfix can’t for unknown reasons. Also, the chroot script was run and resolv.conf was properly copied in /var/spool/postfix/etc and has the proper permissions. I suspect that some kind of limitation is put on postfix processes in the chroot jail, but I don’t know where to look and what to look at. Anyone ever experienced something similar? Best regards, Jean-Philippe Méthot Openstack system administrator Administrateur système Openstack PlanetHoster inc.
