|This error is usually either dns error, or the daily email limit being reached (if you've enabled it)|
dig MX domain.comfor the domain that is "Unrouteable".
This will check to see if it resolves.
2 If it doesn't, then check your /etc/resolv.conf file to see which IPs are listed there for your nameserver lookups.
Since you likely run your own name server, you can add:
nameserver 127.0.0.1to the top of the /etc/resolv.conf file to tell your system to use your own local nameserver, if the other IPs are not working.
3) If the dig does work, then check the file:
if there is a numerical number other than 0, then that limit has likely been reached.
you can change the limit to a higher number if you want.
4) If the lookup does work, but it's not a limit issue, it might be the ISP blocking the outbound port 25. The way to test that is to try to telnet to port 25 on the IP that the MX value resolved to in step 1). Eg:
telnet 18.104.22.168 25where 22.214.171.124 is the IP of the A record.. of the MX value from step 1. If you cannot connect to it, then your ISP is blocking port 25 from your server out, and you'd need to use this guide to force all email out through your ISPs mail system.
|How to update your exim.conf|
|How to limit the number of emails sent by each user (prevent spammer)|
|I need exim to send all outbound email through a remote mail server|
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