Our backup mail server (which I have just re-configured) tries to contact the primary mail server, and fails. My log shows repeatedly "connection refused": May 15 22:21:41 mx2 sm-mta-rx[8674]: q4FIhPij007483: makeconnection (mail.greenspot.fi. [83.143.217.182]) failed: Connection refused by mail.greenspot.fi. May 15 22:21:41 mx2 sm-mta-rx[8674]: q4FIhPij007483: to=<myuser at mydomain.com>, delay=00:38:16, xdelay=00:00:00, mailer=esmtp, pri=10021795, relay=mail.greenspot.fi. [83.143.217.182], dsn=4.0.0, stat=Deferred: Connection refused by mail.greenspot.fi. But yet I can successfully telnet that host: # telnet mail.greenspot.fi 25 Trying 83.143.217.182... Connected to mail.greenspot.fi (83.143.217.182). Escape character is '^]'. 220 mail.greenspot.fi ESMTP Sendmail; Tue, 15 May 2012 22:34:22 +0300 Also, the mailer-daemon *can* send automatic warning messages to mail.greenspot.fi just fine. So, the error probably is in my sendmail configuration. The error appeared as I today reconfigured the backup mail server to use a "dual sendmail" setup with amavis and greylisting. How could I proceed? - Jussi