Swift mailer default sender - php

Question

I'm trying to set a default sender to all messages in Swift Mailer 4.3.0, but couldn't find a proper solution. I want to avoid using ->setFrom() in every message, since it'll be a future headache. I could use a constant for that, but I was looking for a more elegant solution.
$message = Swift_Message::newInstance()
->setSubject('subject')
->setFrom(array('sender#domain.com' => 'Sender'))
->setTo(array('recipient#domain.com'))
->setBody('Message');
Thanks!

Answer 1

You can't.
As far as I know, you can't omit this parameter.
A From: address is required and is set with the setFrom() method of the message. From: addresses specify who actually wrote the email, and usually who sent it.
This is maybe the best solution:
->setFrom(MyClass::FROM_EMAIL);
Once thing you can try, is to create an instance once in your application, and clone it when you want to send a new mail without re-defining the from part:
// somewhere early in your app
$message = Swift_Message::newInstance()
->setFrom(array('sender#domain.com' => 'Sender'));
And then, somewhere else:
$newMessage = clone $message;
$newMessage
->setSubject('subject')
->setTo(array('recipient#domain.com'))
->setBody('Message')
->send();

Answer 2

If you use a SwiftMailer ≥ 4 and are familiar with Composer, you can use a Defaults Plugin for SwiftMailer to achieve this.
First install the package:
composer require finesse/swiftmailer-defaults-plugin
Second set up a Swift_Mailer instance:
$mailer = new Swift_Mailer(/* your transport here */);
$mailer->registerPlugin(new Finesse\SwiftMailerDefaultsPlugin\SwiftMailerDefaultsPlugin([
'from' => ['sender#domain.com' => 'Sender']
]));
And then send emails without specifying the from address:
$mailer->send((new Swift_Message())
->setSubject('subject')
->setTo(array('recipient#domain.com'))
->setBody('Message'));