I am hosting multiple domains on an email server where the SSL certificate is for the root domain name (let's say example.com). The rDNS goes to example.com, but the alias domains on the server are emailhere.com and emailhere2.com for example. Unless someone goes digging, they won't see example.com show up as the emails are going to the alias emails, but it shows up under rDNS for the server IP. If I change example.com to a new TLD domain like 'example.network' along with the rDNS, is there potential to get blacklisted by other email servers even if the alias email domains do not change? Would it be safer to stick to a .com TLD?
To reword, do blacklists care about domain name TLD for the mail server if the alias domain name sending the email is something like '.com'?