Namaste to all,

I would like to get a clear explanation of how Aum/Om is supposed to be pronounced. I have seen spellings such as aum, auṃ, om, and oṃ. The question is whether the letter "m" is supposed to be pronounced as in "mail," "manner," etc., or pronounced as "ṃ," the anusvara, nasalizing the vowel sound.

Praṇāma!