Missatges enviats per Howard Miller

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I don't see anything in there that appears to be anything related to Moodle.

However, I've never used cPanel and I see Softaculous in there. Is that how you installed Moodle? We can't really comment on Softaculous as it's not part of Moodle and we don't know what it does.
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That's a nice picture, but what's your question or concern?

I see Softaculous mentioned there, so you might be asking the wrong people, anyway.
 
All that phpml stuff would appear to be a PHP-based "machine learning" application. Nothing to do with Moodle.
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Ok - but it's the same underlying problem. You are asking Moodle to send an email with a 'reply-to' of some arbitrary user. In normal circumstances a mail server will require the user to authenticate against that mail server before they are allowed to send a message with their from/reply-to set to their own email address. This is sensible security against spam.

Clearly Moodle would be 'masquerading' as a user's mail account and no email server will permit this. Well... unless you have full control over the mail server. This is even before we come to the issue of Moodle supporting this mode of operation. But that's why it does not. In 99% of cases it won't work and would just cause confusion.
 
And then, as Visvanath alluded to, would your users really appreciate receiving emails replying to an email message that they did not send (they didn't; Moodle did)?
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That sort of thing is unlikely to work unless you have considerable access to configure your mail server. And you know how. Most mail servers will just reject that as spam. Moodle looks like it's pretending to be those users sending the mail. And, of course, it actually *is*.

Again - sorry to sound like my "needle is stuck" - but this is just conflating on online forum with old-fashioned email. They are not the same thing.