Hey I have used guzzlehttp before with great success with laravel only and now also octobercms projects, but on the current one I'm working on I keep getting this error:

Passing in the "body" request option as an array to send a POST request has been deprecated. Please use the "form_params" request option to send a application/x-www-form-urlencoded request, or a the "multipart" request option to send a multipart/form-data request.

I can't say I understand what they mean or why this happens? It says this same message no matter which mail template I try sending test mails with, It used to just work :/

Kind regards, Thomas

Probably you are using a send method that needs the October.Drivers plugin. Try to install this: http://octobercms.com/plugin/october-drivers and see if the error is gone.

Thank man that worked! I first had to remove guzzlehttp and then install the drivers plugin, and then it worked, I recon it's something they changed in the latest release, as my last project which was done before it worked.