Hi @foliovision
We don’t understand your message. We don’t have any problem with our mails in our invoiceninja setup. We had a problem one year ago with considering HTML messages as SPAM and we solved it like we have said months ago. Our problem was with Hotmail clients email accounts, for having external references in our HTML design, and we fixed it as we have said.
We don’t use Cloudtron. They are a lot of different providers (OVH, AWS, etc…) and in our case, we have our own physical servers and infrastructure. We are a hosting company like Cloudtron, and we are experts in mail servers and hosting solutions in Spain.
Paying white label is not relevant to having the warranty your messages are going to deliver into inbox. Appart of that, if using cloudtron, and sending in txt format, is enough for you, and receive your client the messages in inbox, perfect. We don’t need to say anything else. If you think your messages are going to SPAM, like CEO of a hosting company, Metainnova, we have to say you the problem is not with your invoice ninja setup, white label, etc., is with the IP range of your VPS provider. Surelly, your IP is blacklisted in any DNSBL list, and is irrelevant you have in your provider SPF, DKIM or DMARC in white. They exists more filters, like DNSBL and SenderScore (the punctuation of the server is sending the emails.
Sorry for insisting you, but we are experts in this area, and is important checking the delivery of the message in the destination (not in your side, the senders side). So please, if you want to verify why the destination is sending the mail to SPAM, you have to take a look to the punctuation of the IP server is sending the message (contact your provider if you don’t know what is the IP of the mail service, or verify the IP of your VPS if is a dedicated VPS and sent directly for it), and verify there is not in any DNSBL. The webpages we have sent to you are used by Microsoft and Google.
In the other side, I disagree with you with HTML design posibilities. Efectively, the design of default HTML messages in invoiceninja is simple or ugly, but if you have HTML5 and CSS knowledge, you can create beautiful and professional email notifications modifying source code (and of course, we are agree with you with collaborating with the project and with Hillel Coren).
We hope to have been helpful.