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Solaris email problem

Since our last server reboot we have been unable to send mail to internet addresses, but we can still send email to other users on the server. Is there a parm file somewhere that defines what addresses are recognized by the server for email?
Unix OS

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8/22/2022 - Mon

Which mailserver do you have sendmail. Postfix, etc.
Look at /var/log/maillog
Re you able to resolve any domain? nslookup -q=mx domainname or dig domainname mx

You may have defined a smart host that is no longer available.

The server name and IP address are returned
The IP address returned has a #53 on the end of it..  And the dig says address not found.

Would you know where the IP address in the NSlookup is stored on the server?

Okay, I did the dig wrong (rookie error). It does show a reasonable reply.

I'm using mailx... I try to send a msg from the command line... I don't get an error. The log file for my ID has content...but the mail never arrives.
Your help has saved me hundreds of hours of internet surfing.

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They say the "recycled" sendmail...it is working now.