Changed Host IP and now outgoing mail does not work

Hi!

My host has changed my webpage IP (It´s a VPS), and now the outgoing mail does not work.

Of course, I´ve changed the DNS registries in Cloudflare, changing everywhere the old IP with the new one. So the web is working, I receive mails… but can´t send.

The marketing automation services is also failing and does not send emails…

Any idea about which could be the problem?

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