DKIM not working

Question

I tried to setup DKIM with no success. 
 
 1. I used (on my local Linux box) openssl to generate a 1024bit RSA key pair. 
 2. I added the public key into DNS and let it propagate (for the moment with testing mode "t=y" ) 
 
 $ host -t txt testing._domainkey.mydomain.example 8.8.8.8 Using domain server: Name: 8.8.8.8 Address: 8.8.8.8#53 Aliases: 
 testing._domainkey.mydomain.example descriptive text "v=DKIM1;k=rsa;t=y;p=MIGfMA0......DwIDAQAB" 
 
 3. I configured the UTM as follows 
 Priate key = 
 
 -----BEGIN PRIVATE KEY----- MIIC... ... ... ... -----END PRIVATE KEY----- 
 
 selector = testing 
 DKIM-Domains = mydomain.example 
 
 4. I used https://www.appmaildev.com/en/dkim to check. Result: DKIM-Result: none (no signature) 
 Why is no signature added? According to the result at the receiving end, the mail is from the specified DKIM domain: 
 From: "Real Name" <username@domain.example>

hagman_01 · Answer

Apparently, my mistake was with step 1 (though I for sure do know how to generate key pairs). I don't recall which guide I followed (I am sure is was not by you), but that guide made me generate the keys per 
 openssl genpkey -algorithm RSA ... 
 Meanwhile I managed to findi a matching thread - no idea why seraching for "RC -101" previously gave me no better results. According to that, I regenerated keys per 
 openssl renrsa ... 
 and that key pair worked instantly. I am still scratching my head about the reasons (perhaps genpkey generated a key protected by no keyword instead not protected by a keyword?), but who cares when it works fine now ...

DKIM not working

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