Hi,
Let's configure it with Mumara as for the high volume email delivery it offers advanced features and constitutes the best blend with PowerMTA. We are email infrastructure providers since almost a decade and we too have been using IEM before it stopped further dev and Mumara came into being.
1) Will you provide the VPS to configure PowerMTA? or we'll have to get it and configure it for you?
2) Will be done and I would suggest Mumara here or IEM
3) For the support of attachment with all the extensions, we'll need to test it out. Although most of these applications including Mumara helps you send files in attachment, not certain if it includes MP3 as well, and nor did they mentioned it on their documentation. We'll test, however.
4) Indeed, all DNS records will be implemented for sustainable delivery
5) cPanel license costs, if we are gonna provide you the VPS, we'll provide you cPanel as well
6) How many domains are you looking to get this server configured, one will be the primary domain to host Mumara and tracking links and for the sending domains if the volumes are high, go for at least 2? Will be done on your preferences.
7) IP rotation and SSL will be done
Rest assured, other things including configuring bounce processing, signing up for ISPs provided loops for FBL processing, appropriate config of PMTA down to the domain and IP level, will be carried out.
Looking for the response to get it started.
Regards,