Open rate using Mailwizz

[Sandeep Saxena]

I observed for number of my clients that when we send a campaign using Mailwizz connected to Sendgrid, SendinBlue, Mailgun - the open rate is low in comparison to when we send the same campaign directly using the dashboards of Sendgrid, SendinBlue or Mailgun. I suspect that this is because of some headers which are being inserted by Mailwizz. Has any one observed it earlier? Are there are guidelines on how to tune the configurations/headers when integrating Mailwizz with these providers.

 

[Joseph Ollero]

Same here. I have even observed it between 2 versions of Mailwizz whose difference are the headers. However, twisted says he is sure that it's with blacklisting of the IP of the mail server.