How to globally exclude certain email addresses from the mailer?

[jameslkingsley]

How can I exclude certain email addresses from the Laravel mailer? Scenario I'm working with is when emails are marked as bounced/complaint and should be excluded in future emails. I'd like to handle this automatically where the mailer will exclude those emails for me.

Something like:

Mail::setGlobalExclusions(function () {
    return arrayOfEmailAddressesToExclude();
});

And then if I were to use the Mail::to() method, it would ensure none of the excluded emails are used:

public function to($users)
{
    return (new PendingMail($this))->to(
        $this->removeExclusions($users)
    );
}

Is this currently achievable in Laravel somehow?

[jameslkingsley]

Just had an idea that maybe I could listen for the MailSending event and drop the mail if it's excluded, but I'm not sure there's enough control exposed to actually do that.

[mfn]

If you control every place you send emails, you could just write a central wrapper for your Mail:: calls which ignores certain recipients?

Sound probably too simple otherwise I guess you would have done that 🤔 😏

[jameslkingsley]

Yea I could do that I suppose, would just mean that other developers would need to be aware of said wrapper and detaches from the Laravel framework way a bit.

[jameslkingsley]

Think I reached an okay solution:

Registered a replacement MailManager in my own MailServiceProvider:

class MailServiceProvider extends ServiceProvider
{
    public function boot()
    {
        $this->app->singleton('mail.manager', function ($app) {
            return new MailManager($app);
        });
    }
}

And then MailManager just extends the framework base, overriding the resolve method to use a custom Mailer class to adds the exclusion logic.

[jameslkingsley]

It would be better if Laravel resolved the Mailer class out of the container so that it could be properly overridden - at the moment it's implemented like this:

protected function resolve($name)
{
    $config = $this->getConfig($name);

    if (is_null($config)) {
        throw new InvalidArgumentException("Mailer [{$name}] is not defined.");
    }

    $mailer = new Mailer(
        $name,
        $this->app['view'],
        $this->createSwiftMailer($config),
        $this->app['events']
    );

    ...
}

But I imagine that's largely out of scope and only applicable in rare use cases.