Help for Aimeos

For some reason, everytime I place an order, I get the confirmation email twice. Even the message ID is the same!

Any help pointing me in the right direction would be much appreciated. My cron jobs appear to be set properly.

Aimeos version: 2017.10
PHP version: 7.1
Package: Laravel 5.5
Environment: Linux

Did you configure the same e-mail as BCC?

No, the BCC and the FROM email are the same, but the TO address is different....

Ok, figured this out, it's only happening with mailtrap.io, it's fine with a production email service.