I just set up a new Odoo10 instance. Unfortunately I can't send mails through odoo:

SMTPRecipientsRefused: {'sdfslkdfj@gmx.net': (554, '5.7.1 Recipient address rejected: Username triage@xxx.ch and sender bounce+4-res.partner-9@xxx.ch doesnt match')}

If I am correct, this is because the 'sender verification' on my mail server is turned on. Unfortunately I can't turn it off...

So the mail server doesn't accept the message because odoo is using a dynamically created mail alias.

Any ideas how to solve this issue?

Thank you