What is the default value of MAIL_ENCRYPTION in Laravel 5.6?

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My doubt boils down to the definition of MAIL_ENCRYPTION, in the archive .env we have MAIL_ENCRYPTION=null and inside the archive config\mail.php line 74 we have the stretch:

'encryption' => env('MAIL_ENCRYPTION', 'tls'),

Whereas in the archive .env MAIL_ENCRYPTION was set to null, its final value will be tls?

I was in doubt because the attribution of null confused me.

laravel

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In that case it shall be as defined in .env (null).

> php artisan tinker
Psy Shell v0.8.17 (PHP 7.0.26 — cli) by Justin Hileman
>>> config('mail.encryption')
=> null

To use the default value, comment your .env with #MAIL_ENCRYPTION= or remove the line altogether.

> php artisan tinker
Psy Shell v0.8.17 (PHP 7.0.26 — cli) by Justin Hileman
>>> config('mail.encryption')
=> "tls"

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