Basically I am trying to track down the cause of a problem when using sendmail. It seems to work fine to the majority of hosts, however there is a problem which one recipient (lets say hick@jimbob.com) is not getting the emails.
Something to note, when I tried pinging jimbob.com (domain used in the email address) it does not give any results. However the internet browser is able to open the website of jimbob.com, and outlook is able to successfully send to hick@jimbob.com.
Which makes me think this is down to a problem within sendmail. Anyone idea's on how to diagnose this issue?
Let's start with jimbob... smtp uses port 25, if jimbob.com is alive on that port this will show it:
Code:
ping -p 25 jimbob.com
Will definitely try that in the morning. Thought it was very odd not being able to ping it even though their web and mail (from outlook) was receiving traffic fine.
Quote:
Originally Posted by jim mcnamara
Do the emails to jimbob show up in the user's dead.letter file? If not, the problem is outside your sphere of control.
I sent a test email using sendmail yesterday, I'm not exactly sure about "dead.letter" but they were scanning their mail log files and they never seen any existence of the mail getting through (or even any activity from our domain).
Is there anything I can do to verify it is not at my end? Perhaps try to trace where the sendmail is taking my message in each hop and see where it drops off? I would like to know for sure it is leaving our space and is sent to them, if that makes sense. Just not sure how to go about doing this....
Something to note, when I tried pinging jimbob.com (domain used in the email address) it does not give any results. However the internet browser is able to open the website of jimbob.com, and outlook is able to successfully send to hick@jimbob.com.
This could be caused by a firewall, which cuts off ICMP traffic. This is rather common these days, even if it is bad firewalling style to do so.
Another idea, unrelated to this: did you check the MX records for the domain jimbob.com and have you checked that the mail exchanger is working?
This could be caused by a firewall, which cuts off ICMP traffic. This is rather common these days, even if it is bad firewalling style to do so.
I'm not ruling that out either... but as ya know I have to rule other options out first in this situation. And that means doing some stalking on that mail and finding out where the bread crumb trail finishes. Just not sure how to go about doing this form of tracking.
Quote:
Originally Posted by bakunin
Another idea, unrelated to this: did you check the MX records for the domain jimbob.com and have you checked that the mail exchanger is working?
I checked the MX record and it showed the mail servers as some amateurish outfit, when I looked at their website - but I'm not one to judge a book by its cover :-)
How would I confirm that the mail exchanger is working? Is that where I telnet into it?
Quote:
Originally Posted by chompy
Anything useful in the /var/log/maillog, like a code 250 (sendmail success), or a timeout, or name unresolved?
Code:
cat /var/log/maillog | grep jimbob.com
I looked for a log file, but didn't manage to find it at the time. I will check that directory location tomorrow, but if it isn't there is there a way to create one temporarily for sendmail?
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