Malachi is written to those who were under the old covenant. Christians are not under the old covenant.
In order to "warrant" the blessings mentioned in Malachi 3, one must abide by the ENTIRE MOSAIC LAW, not just "tithing".
If they somehow managed to abide by the rest (impossible today), they would be tithing on agricultural produce only. NO OTHER "TITHE" IS REQUIRED ANYWHERE IN SCRIPTURE.
Christians are called upon to give. We are NOT required, or even asked, to "tithe".