Did you install guzzlehttp/guzzle?
Documentation: https://laravel.com/docs/5.7/mail#introduction
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SOLVED! I removed the guzzlehttp/guzzle from composer.json and it works fine now.
composer remove guzzlehttp/guzzle
I have mailgun setup but keep getting a curl error when I try to reset password.
GuzzleHttp \ Exception \ ConnectException cURL error 6: Could not resolve host: https (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)
I can get MailGun to send email via the key, without Laravel: https://documentation.mailgun.com/en/latest/quickstart-sending.html#send-via-api
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