using my E-mail aliases with Apple's Mail app??????

Easy breezy. Open the Mail app and click on the Compose Message icon in the lower right corner of the screen. This brings up a fresh, empty email page with only the "From" section filled in with your primary email address. Touch your address (possibly twice) and you will see a scroll wheel of your alias options at the bottom of the screen. Scroll until you find the one you want, select and voila!

 

Hmmm… Ok, let's try something else. First, so we are on the same page, are we talking about iCloud/MobileMe/.Mac aliases? In other words, aliases of an Apple supported email?

If so, then try this to ensure your options for aliases are all selected. Log into the iCloud account on your web browser. Select Mail, then go into settings (bottom left corner of your window; if you have a lot of folders you may need to scroll down to see the settings gear). There should be 5 tab selections including one called Composing. Select that and you will see options to select your default email as well as a list of your aliases. Make sure the aliases you want to use are selected by checking the relevant checkboxes. Once they are selected/checked, you should be able to get them on your mobile device (once iCloud has synced the preferences anyways).

See if that works.

 

Gotcha. If what I suggested doesn't also work with Hotmail then I'm out of ideas. Sorry and good luck.

 

A shot in the dark: have you tried simply adding another account, using your alias?