Malachi is the last of the Minor Prophets books in the Old Testament, but is not so placed in Jewish scriptures. The name, Malachi, is thought to mean ‘my messenger’ or ‘messenger of the Lord’ or ‘my angel’. It may also mean ‘by the hand of His messenger’. The name is not necessarily a personal noun, and so possibly refers to an anonymous writer. However, some say Ezra was the author, but even this is disputed. Others say the name is a personal noun. Suffice to say we do not really know.
The Book contains six sections that show how lax the priests had become, and how God loathes what they did. Jews no longer accept that reference to mixed marriages is genuinely from God… but modern Jews do not believe their own God anyway!
The Book was written after the Babylonian exile, when Judea was ruled by Persia and the Temple had been rebuilt, despite a very low incidence of belief. It is this allusion to Persia, by using a Persian title for ‘governor’, that suggests the date of writing.