I have inherited a Fedora 10 machine running Postfix 2.5.6. Everything has been working well (all emails going out) up until about 3 weeks ago. I have been receiving complaints mail not getting delivered in a timely manner. Very new to Linux. I looked in the log files and I am seeing many lines like this. (blanked out email address)
Line 19168: Feb 5 09:21:54 fedora postfix/error: EF712966073: to=<firstname.lastname@example.org>, relay=none, delay=1050, delays=1050/0/0/0, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with outbounds7.obsmtp.com[18.104.22.168] while sending RCPT TO)
I message will often get 1 or 2 of these and then finally go out. I have been hunting around on the net - but to no avail. Thanks in advance for your time - I appreciate it.