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Alerts not sending emails

Posted: Wed Mar 30, 2016 5:16 am
by azam101
Nagios is creating notifications, but does not send a email. Test email works fine and So does the custom notification.
Were are using a SMTP relay server, dont understand why the test and custom work, but nagios is not sending anything when a alert is triggered.
Below is from the mailog, what is the different in config between the test and custom compared to the alert notification?
What should we be looking at? We have checked firewall settings everything is allowed.
Currently we are using a trial version to test before buying.


Mar 30 10:48:09 nagiosxi-64 postfix/smtp[10531]: connect to cust25070-2.in.mailc ontrol.com[85.115.54.190]:25: Connection timed out
Mar 30 10:48:09 nagiosxi-64 postfix/smtp[10529]: connect to cust25070-2.in.mailc ontrol.com[85.115.54.190]:25: Connection timed out
Mar 30 10:48:09 nagiosxi-64 postfix/smtp[10528]: 9C6569BE: to=<[email protected]> , relay=none, delay=75992, delays=75932/0.01/60/0, dsn=4.4.1, status=deferred (c onnect to cust25070-2.in.mailcontrol.com[85.115.54.190]:25: Connection timed out )
Mar 30 10:48:09 nagiosxi-64 postfix/smtp[10531]: 7F5F9727: to=<[email protected]> , relay=none, delay=88703, delays=88643/0.02/60/0, dsn=4.4.1, status=deferred (c onnect to cust25070-2.in.mailcontrol.com[85.115.54.190]:25: Connection timed out )
Mar 30 10:48:09 nagiosxi-64 postfix/smtp[10532]: 6878C93B: to=<[email protected]> , relay=none, delay=92866, delays=92806/0.03/60/0, dsn=4.4.1, status=deferred (c onnect to cust25070-2.in.mailcontrol.com[85.115.54.190]:25: Connection timed out )
Mar 30 10:48:09 nagiosxi-64 postfix/smtp[10530]: 29540728: to=<[email protected]> , relay=none, delay=88700, delays=88640/0.02/60/0, dsn=4.4.1, status=deferred (c onnect to cust25070-1.in.mailcontrol.com[85.115.52.190]:25: Connection timed out )
Mar 30 10:48:09 nagiosxi-64 postfix/smtp[10529]: 28F1B93A: to=<[email protected]> , relay=none, delay=92871, delays=92811/0.01/60/0, dsn=4.4.1, status=deferred (c onnect to cust25070-2.in.mailcontrol.com[85.115.54.190]:25: Connection timed out )
Mar 30 10:48:09 nagiosxi-64 postfix/error[10872]: 876E1498: to=<[email protected] >, relay=none, delay=84487, delays=84427/60/0/0, dsn=4.4.1, status=deferred (del ivery temporarily suspended: connect to cust25070-2.in.mailcontrol.com[85.115.54 .190]:25: Connection timed out)
Mar 30 10:48:09 nagiosxi-64 postfix/error[10872]: 8885C827: to=<[email protected] >, relay=none, delay=80325, delays=80265/60/0/0, dsn=4.4.1, status=deferred (del ivery temporarily suspended: connect to cust25070-2.in.mailcontrol.com[85.115.54 .190]:25: Connection timed out)
Mar 30 10:48:09 nagiosxi-64 postfix/error[10872]: E52D59AE: to=<[email protected] >, relay=none, delay=76117, delays=76057/60/0/0, dsn=4.4.1, status=deferred (del ivery temporarily suspended: connect to cust25070-2.in.mailcontrol.com[85.115.54 .190]:25: Connection timed out)

Re: Alerts not sending emails

Posted: Wed Mar 30, 2016 9:58 am
by azam101
This issue has now been resolved,

The issue was down to the system sending larger TCP packets than possible due to additional headers from vlan tagging.

The fix was to set the MTU value on the sending host.

Re: Alerts not sending emails

Posted: Wed Mar 30, 2016 10:02 am
by rkennedy
You're too fast for us! Glad to hear you got it working.

I'll go ahead and mark this thread as resolved, but if you need any assistance in the future feel free to create a new one.