Oracle cloud email setup

[sahsanu]

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Receiving mail, but sent mail isn't arriving

Hi, I’ve just set up HestiaCP and it’s been working good for everything but the webmail - the mail I send out doesn’t arrive nor does it bounce back (although Roundcube says its sent successfully), there are no errors thrown, it is not in junk on the recipients end. It looks as it goes into a void. The mail I send from outside into my HestiaCP hosted e-mail address arrives instantly. Any ideas? Thanks in advance