How do I handle special chars in the credentials of the Symfony Mailer component in SMTP transport?

Question

Context

In Symfony 4.3 a new emailer was introduced.

See here:

• https://symfony.com/blog/new-in-symfony-4-3-mailer-component
• https://symfony.com/doc/4.4/mailer.html.

For the SMTP transport it is established that the DSN in the ENV var has this format:

MAILER_DSN=smtp://user:[email protected]

Question

How do I handle special characters in the user and password when writing the DSN?

Let's suppose that the credentials are:

username: [email protected]
password: the:password:is:difficult

Setting like this most likely will fail:

MAILER_DSN=smtp://[email protected]:the:password:is:[email protected]

How should I encode/escape things? What would be a correct DSN for it?

Answer 1

You can urlencode the values.

There's a test in the Mailer component (Tests/Transport/DsnTest.php) indicating that it should work with encoded values.

So you can use an online encoder to convert your values (e.g.https://www.urlencoder.org/)

Your string:

MAILER_DSN=smtp://[email protected]:the:password:is:[email protected]

Become:

MAILER_DSN=smtp://alice%40example.com:the%3Apassword%3Ais%[email protected]