Ok I admit it is not too clean and needs some more efforts to refine it. But it is here and it works with blaogy.com
What I did is to create a domain mail forwarding. You have to be sure that everything mailed to your domain (eg. firstname.lastname@example.org) is forwarded to an email address to be parsed (I use gmail :-) )
Then in the moblog configuration you put gmail's config (In my case since gmail use SSL, don't forget to put ssl://pop.gmail.com)
And that's all.
If you find some improvements, please let me know