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Where plesk 17 (onyx) store dkim public key?

How to find postfix public domainkey in plesk server for dkim dns settings?

After plesk dkim activation any services (like opendkim) not required.
The keys store in «/etc/domainkeys/», but public dkim keys do not store.

We can easily generate them:

# openssl rsa -in /etc/domainkeys/somedomain.tld/default -pubout -out /etc/domainkeys/somedomain.tld/public
# writing RSA key

After that you will see:

# cat /etc/domainkeys/somedomain.tld/public
-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDNP/0esApEWVmQEtjbT8WGJSyPhKpNvxuxHDSf/TChc1ssgO+DWtXOdFyd/jM1L+vtBUOXLewmrWJ+shnAiZOibyR2LtCvmBZ44K08UvC6Xqnz8Jh9BLv9K0KZ/3tX7UU0DMHQ/zWb1Ya6cWHfkfJc4H+DkqAGQhQPZMk3nrwXVwIDAQAB
-----END PUBLIC KEY-----

And than you can set up it in you dns hosting provider, like:
name: default._domainkey
type: TXT
value: "k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDNP/0esApEWVmQEtjbT8WGJSyPhKpNvxuxHDSf/TChc1ssgO+DWtXOdFyd/jM1L+vtBUOXLewmrWJ+shnAiZOibyR2LtCvmBZ44K08UvC6Xqnz8Jh9BLv9K0KZ/3tX7UU0DMHQ/zWb1Ya6cWHfkfJc4H+DkqAGQhQPZMk3nrwXVwIDAQAB"

For dkim testing you can use this service.