After spending lot of testing, really a lot, I can conclude that I would need some help from a very very kind advanced user with mutt.
I would be so happy to have my emails in Mutt that work on the offlineimap (based).
I could write offline, and send when I get internet.
Would you be so kind to post three already configured files .muttrc and .offlineimaprc and .mbsmtp that would do such purpose.
This would be extremely kind from you, if you know how to realize/make this all working.
I am looking forward to reading/hearing you.