Of course, It's completely counter-intuitive to pronounce it pah-ster-ous. Especially for an email to post blogging platform.

Your way makes more sense. You use it to post things and it isn't preposterous.

They need to fix the pronunciation.

I've always read it pah-steer-eee-us. I know that's wrong but the word has always looked like posterior to me. Fun service though.