[Mailer] Mailjet Add ability to pass custom headers to API #14137
Description
| Q | A |
|---|---|
| Feature PR | symfony/symfony#37934 |
| PR author(s) | @tcheymol |
| Merged in | 5.2-dev |
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| Q | A |
|---|---|
| Feature PR | symfony/symfony#37934 |
| PR author(s) | @tcheymol |
| Merged in | 5.2-dev |