I don’t receve notifications

The only thing I can suggest is to debug the whole process – check every log (including the mail service you use).

The plugin uses the regular WordPress mail functionality and it works without any issue I can not imagine what could go wrong, if WordPress itself sends e-mails properly, sorry.

In wordpress I have configurated a smtp for send mails, will the plugin use that?
The problem I think it not try to send it because if it try I think I would see it with the mail log

Yes, the plugin will use whatever is configured since technically it would be much more trouble for any plugin to send e-mails without the WordPress mail functions.

The plugin uses wp_mail(), also see https://github.com/arnowelzel/comment-reply-email-notification/blob/main/classes/CommentReplyEmailNotification.php#L254 and the WP developer documentation at https://developer.www.ads-software.com/reference/functions/wp_mail/.

If this function does not work at all in the plugin, the only way to find out is to check the logs of your server(s) – there is no other way, sorry.

It doesn’t even try to send the emails because I see in the log all the other emails sent.
It’s strange because in the subscriptions section I see that they are there.

I am sorry – but I don’t know how to help with this. The plugin works fine on many other websites (including my own sites) and I never had this issue, so I don’t know what is going wrong. Did you check, that the sender address in the plugin settings is configured properly? If you don’t want to use the WordPress default sender, you must put a valid e-mail address there which is accepted as sender by your mail server.

Yes the mail is right, but I think it doesn’t even try to send because otherwise I would see it in the plugin that logs the email, when I was configuring the blog it warned me about attempts to send email with a bad configuration.

Then I don’t know how to solve this, sorry.