Thank you for your answer and suggestion.
We have to think twice about it, because if i'm not wrong it would:
- Double the domains count we have (around 6000)
- Need to add in every domains (we don't have control over all the domains) MX, DKIM, SPF, DMARC? entries for each subdomain
- Existing newsletter would have to be moved to the subdomain and having our customers to apply the changes wherever they referenced it
It would have been lot easier to have an option to select a different outgoing gateway for newsletter outgoing SMTP traffic, should it be Global or per domain ?
Would this be a bad idea ?
Feel free to share your thoughts about it :)