Hello Fernando.
It is advisable that you use an external service and link it to your wordpress installation, for example MailChimp
You have information in this blog entry ->
Unlike Acymailing, the emails are sent from the MailChimp servers, so your hosting does not overload your hosting resources, just like working with templates that can overload your website, this is all done from the Mailchimp servers.
You will see that you have several versions, the free version has up to 12,000 emails per month.
I hope this information is useful for what you are looking for, if not, please indicate so that we can continue helping you.
All the best
Answered : 03/05/2018 2:51 pm