How to fix mail sending issue in Aarch64?

I am using Aarch64 server from Oracle Cloud instance. I found Hestia panel now support Aarch64 natively(Usual command works ).
And I create Separate Mail server in panel. If I send mail from there no error showing and also mail not received in my Gmail, I tried it inside PHP file it returns 1 but no mail receives from server.

Any help?

Arch64 support email without any issues

Oracle cloud blocks port 25 use a smtp relay

Hi @eris I already enabled all of mail ports in OCI. Can you please confirm it

But while checking from Putty port not opening

Checking on Google. If you have solution Please let me know

Outgoing port 25 is always blocked

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