Gmail and Outlook dont catch my mails from one of my VPS providers

General
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Hi! I am using node-red-node-email and it works excellently on two VPS from two different providers. But to reduce costs I decided to contract another VPS provider.

And this new one is causing me the next issue:

The node-red-node-email works, it sends the mail but Gmail and Outlook don't get it, I know it sends it because I receive it on my private mail with another domain. I don't know what to do, I don't get any log messages of an error.
I contacted my new provider but they haven't solved anything yet.
Does anyone knows what to do in this case?
Or if someone knows of a mail sender provider or something that you had use in node-red. I am using mails to send tokens and to send email alerts in case of an event in an mqtt device.

PD: I am using Traefik as a reverse proxy with its lets encrypt certs, and docker swarm with three manager nodes.

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So the solution was to contact my vps provider telling them about the problem and they proceed to do something related to open SMTP Ports and something about reverse DNS. But I decided to use SES from amazon. Also to use this node instead node-red-contrib-email

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