Inbox

Hey there!

There can be a few different reasons for this. You will first want to make sure you have proper DNS records set up. You will need an MX record as well as an SPF record. You will also want to make sure you have configured RDNS on your Linode as well.

If you are certain all those are in place, you can test to make sure by using the dig command.

dig +short domain.com
dig mx +short domain.com
dig txt +short domain.com
dig -x ip.address

Those should reveal, in order, the IP address of the domain, the IP address of the MX record for the domain, the TXT record which should include your SPF record for the domain, and also confirm that RDNS is properly configured on the IP address.

If those are all configured properly, you will want to log into the Linode directly and investigate the Linode's mail logs. Those are typically found in /var/log/mail or /var/log/maillog You can double check with ls -a1 /var/log to see what your current mail log locations are. You can view the mail logs themselves with less /path/to/mail/log.

Those errors should let you know why you are having issues with the mail for your Linode assuming you are using the Linode as a mail server.

Please feel free to share any error outputs you see here and someone might be able to provide more troubleshooting steps for you.