"Your DKIM signature is invalid."

[Sammo]

It's very strange recently. After generating the DKIM key, check it at http://www.mail-tester.com/ ，and always say "Your DKIM signature is invalid"， This type of problem has never been seen before.

[SH]

Do you have latest version? Do you have properly set DNS?

[Sammo]

thank you for your help. I am the latest build, there is no problem with the DNS settings, I have built a lot of servers.

[Scott MacDonald]

Have a look here and try mxtoolbox’s dkim checker…

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https://mxtoolbox.com/dkim.aspx

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Make sure Poste.io is configured with the selector.