Email from Protonmail not received in Zoho mail account.

Email from Protonmail not received in Zoho mail account.

I just wonder, why my Zoho account did not receive an email from the Protonmail account?
But, their Protonmail account can receive my email from Zoho.
I already tried searching on Google but did not get the answer.

Is this the problem on Protonmail or Zoho side?
Thanks!






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