[Mailer] Make sure you can pass custom headers to Mailgun #35162
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I can only assume that there was a mistake to use
$header->toString()
since it makes no sense to include the header name here. That is why this is a bugfix and not a new feature.Without this fix my test will fail:
There are a few similar places for other mailer bridges that looks like they have similar issues. I dont know those providers very well. I can spend time researching them and confirm if there are bugs there too. But first I want to make sure a fix like this is accepted.