Created Module and added a system configuration

Author: jonatanrdsantos

Api/Data/ProviderInterface.php

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+<?php
+/**
+ * ProviderInterface
+ * php version 8.1.*
+ *
+ * @category  Jonatanrdsantos
+ * @package   Jonatanrdsantos_Email
+ * @author    Jonatan Santos <jonatan.zarowny+github@gmail.com>
+ * @copyright 2023 Jonatanrdsantos
+ * @license   https://opensource.org/license/mit/ MIT License
+ */
+declare(strict_types=1);
+
+namespace Jonatanrdsantos\Email\Api\Data;
+
+interface ProviderInterface
+{
+    /**
+     * Get id
+     *
+     * @return string
+     */
+    public function getId(): string;
+
+    /**
+     * Set id
+     *
+     * @param string $id provider identifier
+     *
+     * @return $this
+     */
+    public function setId(string $id): self;
+
+    /**
+     * Get label
+     *
+     * @return string
+     */
+    public function getLabel(): string;
+
+    /**
+     * Set label
+     *
+     * @param string $label provider label
+     *
+     * @return $this
+     */
+    public function setLabel(string $label): self;
+
+    /**
+     * Get host
+     *
+     * @return string
+     */
+    public function getHost(): string;
+
+    /**
+     * Set host
+     *
+     * @param string $host provider host
+     *
+     * @return $this
+     */
+    public function setHost(string $host): self;
+
+    /**
+     * Get port
+     *
+     * @return int
+     */
+    public function getPort(): int;
+
+    /**
+     * Set port
+     *
+     * @param int $port provider port
+     *
+     * @return $this
+     */
+    public function setPort(int $port): self;
+
+    /**
+     * Get protocol
+     *
+     * @return string
+     */
+    public function getProtocol(): string;
+
+    /**
+     * Set protocol
+     *
+     * @param string $protocol provider protocol
+     *
+     * @return $this
+     */
+    public function setProtocol(string $protocol): self;
+}

LICENSE.txt

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+MIT License
+
+Copyright (c) 2023 Jonatanrdsantos
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Model/Config/Source/Authentication.php

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+<?php
+/**
+ * Authentication
+ * php version 8.1.*
+ *
+ * @category  Jonatanrdsantos
+ * @package   Jonatanrdsantos_Email
+ * @author    Jonatan Santos <jonatan.zarowny+github@gmail.com>
+ * @copyright 2023 Jonatanrdsantos
+ * @license   https://opensource.org/license/mit/ MIT License
+ */
+declare(strict_types=1);
+
+namespace Jonatanrdsantos\Email\Model\Config\Source;
+
+use Magento\Framework\Data\OptionSourceInterface;
+
+class Authentication implements OptionSourceInterface
+{
+    /**
+     * SMTP option value
+     */
+    private const SMTP = 'smtp';
+
+    /**
+     * Plain option value
+     */
+    private const PLAIN = 'plain';
+
+    /**
+     * Login option value
+     */
+    private const LOGIN = 'login';
+
+    /**
+     * Return array of options as value-label pairs
+     *
+     * @return array{
+     *          array{value: 'smtp', label: \Magento\Framework\Phrase},
+     *          array{value: 'plain', label: \Magento\Framework\Phrase},
+     *          array{value: 'login', label: \Magento\Framework\Phrase}
+     *      }
+     */
+    public function toOptionArray(): array
+    {
+        return [
+            ['value' => self::SMTP, 'label' => __('SMTP')],
+            ['value' => self::PLAIN, 'label' => __('Plain')],
+            ['value' => self::LOGIN, 'label' => __('Login')]
+        ];
+    }
+}

Model/Config/Source/Protocol.php

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+<?php
+/**
+ * Protocol
+ * php version 8.1.*
+ *
+ * @category  Jonatanrdsantos
+ * @package   Jonatanrdsantos_Email
+ * @author    Jonatan Santos <jonatan.zarowny+github@gmail.com>
+ * @copyright 2023 Jonatanrdsantos
+ * @license   https://opensource.org/license/mit/ MIT License
+ */
+declare(strict_types=1);
+
+namespace Jonatanrdsantos\Email\Model\Config\Source;
+
+use Magento\Framework\Data\OptionSourceInterface;
+
+class Protocol implements OptionSourceInterface
+{
+    /**
+     * None option value
+     */
+    private const NONE = '';
+
+    /**
+     * SSL option value
+     */
+    private const SSL = 'ssl';
+
+    /**
+     * TLS option value
+     */
+    private const TLS = 'tls';
+
+    /**
+     * Return array of options as value-label pairs
+     *
+     * @return array{
+     *          array{value: '', label: \Magento\Framework\Phrase},
+     *          array{value: 'ssl', label: \Magento\Framework\Phrase},
+     *          array{value: 'tls', label: \Magento\Framework\Phrase}
+     *      }
+     */
+    public function toOptionArray(): array
+    {
+        return [
+            ['value' => self::NONE, 'label' => __('None')],
+            ['value' => self::SSL, 'label' => __('SSL')],
+            ['value' => self::TLS, 'label' => __('TLS')]
+        ];
+    }
+}

Model/Config/Source/Provider.php

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+<?php
+/**
+ * Provider
+ * php version 8.1.*
+ *
+ * @category  Jonatanrdsantos
+ * @package   Jonatanrdsantos_Email
+ * @author    Jonatan Santos <jonatan.zarowny+github@gmail.com>
+ * @copyright 2023 Jonatanrdsantos
+ * @license   https://opensource.org/license/mit/ MIT License
+ */
+declare(strict_types=1);
+
+namespace Jonatanrdsantos\Email\Model\Config\Source;
+
+use Magento\Framework\Data\OptionSourceInterface;
+use Jonatanrdsantos\Email\Model\Provider\CollectionFactory;
+
+class Provider implements OptionSourceInterface
+{
+    /**
+     * Custom option value
+     */
+    private const CUSTOM = '';
+
+    /**
+     * Initializes Provider
+     *
+     * @param CollectionFactory $collectionFactory Provider Collection Factory
+     */
+    public function __construct(
+        private readonly CollectionFactory $collectionFactory
+    ) {
+    }
+
+    /**
+     * Return array of options as value-label pairs
+     *
+     * @return array<mixed>
+     */
+    public function toOptionArray(): array
+    {
+        $collection = $this->collectionFactory->create();
+        return array_merge(
+            [['value' => self::CUSTOM, 'label' => __('Custom')]],
+            $collection->toOptionArray()
+        );
+    }
+}