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Latest commit 2027dae Feb 23, 2017 @fabpot fabpot feature #159 allow using env variables in transport configuration (my…
…kiwi)

This PR was merged into the 2.5-dev branch.

Discussion
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allow using env variables in transport configuration

Example:
```yml
# MAILER_URL=transport://user:pass@host:port/?encryption=...&auth_mode=...
swiftmailer:
    url: "%env(MAILER_URL)%"
```

To do:

- [x] add the doc symfony/symfony-docs#7510
- [x] add tests

Commits
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183b291 allow using env variables in transport configuration