Hi Carlos,
In this case I see that different emails have been sent from your website and therefore Google can take it as spam and block them, one option to avoid this is to configure sending through SMTP with a plugin like → you can see information on how to configure it in the following items
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I recommend that you configure the SMTP options with an email from your main domain, in this way you can avoid inconveniences about Google blocks, you can see how to create an email account with your domain from your hosting account in the following guide →
To see the SMTP configuration data for your emails you can see it in the following guide, →
Review these options and tell us how everything went
A greeting
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