I have newest ISP under Ubuntu 16.04 LTS - Perfect Server setup. In last week I have set DKIM for few my domains. Today I checked the result using MxToolbox and I see message that "Public key has been revoked". Could you tell me why this happens? I have generated DKIM under Email --> Email domain --> DKIM button --> Generate DKIM Private-key. I did not change anything except enabled DKIM by using "enable DKIM" checkbox. PS For each domain I did this same, so each of them has this same selector name - default.