I try to send e-mails via SMTP without authentification and I'm getting the following error:
There was an error testing your email settings.
I checked my setup on https://www.smtper.net/. No problems!
I read through the troubleshooting-email-errors page but still found no solution for my problem.
Why can't I find a log under craft/storage/runtime/logs/craft.log. This file does not exist on my system. There is only craft/storage/logs/web.log.
When I use another SMTP server (with auth) everything works as expected. Any ideas on how to find out what's going on here?