Sphered

Thanks for the tip, but this sets one Reply-To address for all emails. We wanted to set it to addresses submitted in the form, so this header changes every email. I already used another SMTP plugin and connected Zoho to it. I had to do a lot of digging because the system ignored a lot of emails, but whitelisting domains finally did the thing. Many sites are victims of the Zoho antispam protection by default, so if anyone’s struggling with the same issue, there you go: Admin console -> Security & compliance -> Spam control -> Trusted list -> Trusted domains -> Here add your site domain and brevo.com for example as in my case.