Cloudron Forum

Nico you should have a look at Amazon SES and Labnify SMTP. Both are very easy to setup and Cloudron supports them. As with most email service providers, you need to add the required DKIM records to your domain's DNS settings; these records add a digital signature to each outgoing email, which can be verified by the recipient's server to confirm that the email hasn't been tampered with and originates from an authorized sender. Next, just as crazybrad already pointed out you must configure PTR (Pointer) records in the DNS settings, which are used for reverse DNS lookups allowing IP addresses associated with your domain to be resolved back into hostnames—this step is crucial because it ensures your messages aren’t flagged as spam by recipient servers due to mismatched information. Once these DKIM and PTR records are correctly set up, any sender using an email address under that domain will automatically gain authorization, meaning they can send emails seamlessly without additional verification steps or complex configurations while maintaining robust security standards.