Symfony 4.4 - Swift Mailer installation failed - swiftmailer

Question

I'm a beginner in Symfony and would like to know how to deal with the following installation issue:
I'm using Symfony 4.4 and trying to install Swift Mailer. Following the documentation on this link, when I ran the following command composer require symfony/swiftmailer-bundle , I got this error message:
Your requirements could not be resolved to an installable set of
packages.
Problem 1
symfony/web-server-bundle is locked to version v4.4.0 and an update of this package was not requested.
symfony/web-server-bundle v4.4.0 requires php ^7.1.3 -> your php version (8.0.12) does not satisfy that requirement.
Problem 2
laminas/laminas-code 3.4.1 requires php ^7.1 -> your php version (8.0.12) does not satisfy that requirement.
symfony/proxy-manager-bridge v4.4.34 requires friendsofphp/proxy-manager-lts ^1.0.2 -> satisfiable by
friendsofphp/proxy-manager-lts[v1.0.5].
friendsofphp/proxy-manager-lts v1.0.5 requires laminas/laminas-code ~3.4.1|^4.0 -> satisfiable by laminas/laminas-code[3.4.1].
symfony/proxy-manager-bridge is locked to version v4.4.34 and an update of this package was not requested.
Any idea how to handle that?
Update:
This is my composer.json file:
{
"type": "project",
"license": "proprietary",
"require": {
"php": ">=7.4.3",
"ext-ctype": "*",
"ext-iconv": "*",
"composer/package-versions-deprecated": "1.11.99.4",
"doctrine/annotations": "^1.0",
"doctrine/doctrine-bundle": "^2.5",
"doctrine/doctrine-migrations-bundle": "^3.2",
"doctrine/orm": "^2.10",
"phpdocumentor/reflection-docblock": "^5.3",
"sensio/framework-extra-bundle": "^5.1",
"symfony/asset": "4.4.*",
"symfony/console": "4.4.*",
"symfony/dotenv": "4.4.*",
"symfony/expression-language": "4.4.*",
"symfony/flex": "^1.3.1",
"symfony/form": "4.4.*",
"symfony/framework-bundle": "4.4.*",
"symfony/http-client": "4.4.*",
"symfony/intl": "4.4.*",
"symfony/mailer": "4.4.*",
"symfony/monolog-bundle": "^3.1",
"symfony/process": "4.4.*",
"symfony/property-access": "4.4.*",
"symfony/property-info": "4.4.*",
"symfony/proxy-manager-bridge": "4.4.*",
"symfony/security-bundle": "4.4.*",
"symfony/serializer": "4.4.*",
"symfony/translation": "4.4.*",
"symfony/twig-bundle": "4.4.*",
"symfony/validator": "4.4.*",
"symfony/web-link": "4.4.*",
"symfony/web-server-bundle": "4.4",
"symfony/yaml": "4.4.*",
"twig/extra-bundle": "^2.12|^3.0",
"twig/twig": "^2.12|^3.0"
},
"require-dev": {
"phpunit/phpunit": "^9.5",
"symfony/browser-kit": "4.4.*",
"symfony/css-selector": "4.4.*",
"symfony/debug-bundle": "4.4.*",
"symfony/maker-bundle": "^1.0",
"symfony/phpunit-bridge": "^5.3",
"symfony/stopwatch": "4.4.*",
"symfony/web-profiler-bundle": "4.4.*"
},
"config": {
"preferred-install": {
"*": "dist"
},
"sort-packages": true
},
"autoload": {
"psr-4": {
"App\\": "src/"
}
},
"autoload-dev": {
"psr-4": {
"App\\Tests\\": "tests/"
}
},
"replace": {
"paragonie/random_compat": "2.*",
"symfony/polyfill-ctype": "*",
"symfony/polyfill-iconv": "*",
"symfony/polyfill-php71": "*",
"symfony/polyfill-php70": "*",
"symfony/polyfill-php56": "*"
},
"scripts": {
"auto-scripts": {
"cache:clear": "symfony-cmd",
"assets:install %PUBLIC_DIR%": "symfony-cmd"
},
"post-install-cmd": [
"#auto-scripts"
],
"post-update-cmd": [
"#auto-scripts"
]
},
"conflict": {
"symfony/symfony": "*"
},
"extra": {
"symfony": {
"allow-contrib": false,
"require": "4.4.*"
}
}
}

Answer 1

Try changing composer.json
From:
"symfony/web-server-bundle": "4.4",
To:
"symfony/web-server-bundle": "4.4.*",
Then try running:
composer update
In order to get the latest versions of the dependencies and to update the composer.lock file: https://getcomposer.org/doc/03-cli.md#update-u,
then:
composer require symfony/swiftmailer-bundle
I recommend that you change from swiftmailer to symfony mailer (https://symfony.com/doc/4.4/mailer.html) because swiftmailer has reached its eol:
https://symfony.com/blog/the-end-of-swiftmailer