Can't get PHPMailer to work even installing it manually via CLI

Hello!

I made a custom installation of HestiaCP, not selecting anything related to email server, as I don’t plan to run any mail server on the host.

But, after trying to install PHPMailer using the following command, it just seems that doesn’t install:
/usr/local/hestia/bin/v-add-sys-dependencies
or
cd /usr/local/hestia/bin && v-add-sys-dependencies

After executing v-add-sys-dependencies nothing is shown in terminal. No errors, no successuful message. Is it supposed to show something once executed?

I already restarted the server, and tried more than single time to run the same command.

No error / output means success

Check if /usr/local/hestia/web/main/vendor has been created…

After cd into /usr/local/hestia/web, no main directory exists.

Sorry it is /usr/local/hestia/web/inc

No problem.

The inc directory exists, and its files/folders:
2fa
i18n.php
prevent_csrf.php
composer.json
mail-wrapper.php
secure_login.php
composer.lock
main.php
vendor
helpers.php
policies.php

The phpmailer folder exists inside vendor.

/usr/local/hestia/web/inc/vendor/phpmailer/phpmailer:
COMMITMENT
language
SECURITY.md
composer.json
LICENSE
src
get_oauth_token.php
README.md
VERSION