DKIM with Exim and Direct Admin
You run your own server, for a few clients or just for yourself. If mail is sent from that server (you don’t use a relay server) chances are that mail delivery isn’t optimal. Especially to GMail and Outlook/Hotmail addresses.
Assumption: Your spf record is fine, including ipv6
Now you need a DKIM record in your DNS and your server to sign it.
Install DKIM
Go here, follow the steps:
https://help.directadmin.com/item.php?id=569
If you use, like me, external DNS servers, you need to add that TXT record manually.
./directadmin c | grep dkim
Will give
dkim=1 dkim_selector=x
So now
– DKIM is on
– The selector is x
Generate DKIM for a domain
List all your domains
cd /etc/virtual
Generate keys
/usr/local/directadmin/scripts/dkim_create.sh domain.com
You can check it by
cd domain.com
ls
And you will see dkim.private.key and dkim.public.key
The public key is the one you want to add to your DNS.
The easiest way to do that is to go to Direct Admin -> Admin Tools -> DNS Administration
Click on your domain and look for TXT entry x._domainkey. Copy that entry over to your external DNS servers.
You can also (while still in domain.com directory)
nano dkim.public.key
or
vim dkim.public.key
The key is between -----BEGIN PUBLIC KEY----- and -----END PUBLIC KEY-----
Copy that key and prefix it with v=DKIM1; k=rsa; p=
Check it
Go to the link below and fill in your domain name and the selector (x)
https://www.mail-tester.com/spf-dkim-check