Domain Names & Emails Help, Please

[AnthonyS]

I've got 2 blogs with very similar names, and associated email addresses. Also 2 mailing lists.
1 ezine's been set up for me and loaded with a 400 email sequence, and Alessandro very kindly helped me set up the 2nd, which I write emails for with AI's help ; and I post 3 times a week.
My question arises because I need names for 2 new sites.
one's for an MLM program, and the other's for a software suite I can sell access to via subscription; hopefully earning passive income via affiliates sending subscribers.
I don't want to have to monitor 4 business email addresses, or confuse visitors with site names.
I've got, for example; mydomainname_com & myverysimilardomainname_com.
if I get mydomainname_net & info for the sites then use the com for the ezines & segment subscribers into 'freebie seekers,' 'MLM,' 'AI' lists etc. Could I avoid confusing them over who's mailing them & why different domain name extensions are involved?
I'm in danger of complicating my life with 4 sites going on, though I'm managing to schedule blog and ezine posts in advance at the moment, so I don't want to have to check 4 email addresses every day.
I realise this is a bit convoluted and involved so T.I.A. for any help and suggestions

 

[hipcat]

You can make it easier on your subscribers using a clearly defined graphic for each entity at the top of the messages sent so they can see who it's coming from.