The opening of the letter (1:1-5) was addressed to the nation. The nation had gone astray, but the letter zeroes in on the priests as the cause for leading the people to do wrong. The priests were being partial in the law (2:9) and caused many to stumble at the law (2:8). They corrupted "the covenant of Levi" (2:8).
Mal 1:6 A son honoureth his father, and a servant his master: if then I be a father, where is mine honour? and if I be a master, where is my fear? saith the LORD of hosts unto you, O priests, that despise my name. And ye say, Wherein have we despised thy name? [question #1]
Mal 1:7 Ye offer polluted bread upon mine altar; and ye say, Wherein have we polluted thee? [question #2] In that ye say, The table of the LORD is contemptible.
Mal 1:8 And if ye offer the blind for sacrifice, is it not evil? and if ye offer the lame and sick, is it not evil? offer it now unto thy governor [the person filling Nehemiah's role as Persian governor in his absence]; will he be pleased with thee, or accept thy person? saith the LORD of hosts.
Mal 1:9 And now, I pray you, beseech God that he will be gracious unto us: this hath been by your means: will he regard your persons? saith the LORD of hosts.
Mal 1:10 Who is there even among you that would shut the doors for nought? neither do ye kindle fire on mine altar for nought. I have no pleasure in you, saith the LORD of hosts, neither will I accept an offering at your hand.
Mal 1:11 For from the rising of the sun even unto the going down of the same my name shall be great among the Gentiles; and in every place incense shall be offered unto my name, and a pure offering: for my name shall be great among the heathen, saith the LORD of hosts.
Mal 1:12 But ye have profaned it, in that ye say, The table of the LORD is polluted; and the fruit thereof, even his meat, is contemptible.
Mal 1:13 Ye said also, Behold, what a weariness is it! and ye have snuffed at it, saith the LORD of hosts; and ye brought that which was torn [possibly stolen; see every other occurrence of gâzal], and the lame, and the sick; thus ye brought an offering: should I accept this of your hand? saith the LORD.
Mal 1:14 But cursed be the deceiver, which hath in his flock a male, and voweth, and sacrificeth unto the Lord a corrupt thing: for I am a great King, saith the LORD of hosts, and my name is dreadful among the heathen.
God was cursing the priests because they were profaning the altar of the Temple by offering blemished things contrary to the Law. God asked if the governor would accept these blemished things as gifts. Obviously neither should He. The priests were robbing God in offerings by breaking the sacrificial Laws. This is exactly what is meant in 3:8 when God said that they were robbing God in offerings. He pronounces a curse on the priests in 1:14, 2:2, and 3:9.
The lashing at the priests continues:
Mal 2:1 And now, O ye priests, this commandment is for you.
Mal 2:2 If ye will not hear, and if ye will not lay it to heart, to give glory unto my name, saith the LORD of hosts, I will even send a curse upon you, and I will curse your blessings: yea, I have cursed them already, because ye do not lay it to heart.
Mal 2:3 Behold, I will corrupt your seed, and spread dung upon your faces, even the dung of your solemn feasts; and one shall take you away with it.
Mal 2:4 And ye shall know that I have sent this commandment unto you, that my covenant might be with Levi, saith the LORD of hosts.
Mal 2:5 My covenant was with him of life and peace; and I gave them to him for the fear wherewith he feared me, and was afraid before my name.
Mal 2:6 The law of truth was in his mouth, and iniquity was not found in his lips: he walked with me in peace and equity, and did turn many away from iniquity.
Mal 2:7 For the priest's lips should keep knowledge, and they should seek the law at his mouth: for he is the messenger of the LORD of hosts.
Mal 2:8 But ye are departed out of the way; ye have caused many to stumble at the law; ye have corrupted the covenant of Levi, saith the LORD of hosts.
Mal 2:9 Therefore have I also made you contemptible and base before all the people, according as ye have not kept my ways, but have been partial in the law.
Mal 2:10 Have we not all one father? hath not one God created us? why do we deal treacherously every man against his brother, by profaning the covenant of our fathers? [the covenant of Levi]
The recipients thus far are still the priests. There has been a lot of cursing involved here. The priests led the people astray in the same way that the priests did not follow the sacrificial code.
Without looking at the context, some mistakenly do not see that the next verses are still directed to the priests.
Mal 2:11 Judah [the divided portion of Israel that was in exile from Persia] hath dealt treacherously, and an abomination is committed in Israel and in Jerusalem [the city where the Temple was]; for Judah hath profaned the holiness of the LORD which he loved, and hath married the daughter of a strange god. [see Nehemiah 13:23-30; especiall 28-30. The priests were responsible]
Neh 13:28 And one of the sons of Joiada, the son of Eliashib the high priest, was son in law to Sanballat the Horonite: therefore I chased him from me.
Neh 13:29 Remember them, O my God, because they have defiled the priesthood, and the covenant of the priesthood, and of the Levites. [see "the covenant of Levi" in Malachi]
Neh 13:30 Thus cleansed I them from all strangers, and appointed the wards of the priests and the Levites, every one in his business;
The actions of the priests introduced this sin of intermarrying with pagans. The priests were especially culpable because they were only permitted to marry other Levites.
Mal 2:12 The LORD will cut off the man that doeth this, the master and the scholar, [priests and lawyers] out of the tabernacles of Jacob, and him that offereth an offering unto the LORD of hosts. [This is parallelism, indicating that the doers of these actions were the same. Only priests were the ones that offered the offerings because only they had legal access to the altar of the tabernacle]
Mal 2:13 And this have ye done again [indicating that the priests, still the recipients, were the ones committing the abomination of intermarrying], covering the altar of the LORD with tears, with weeping, and with crying out, insomuch that he regardeth not the offering any more, or receiveth it with good will at your hand. [God also did not regard the offering because it was offered from a position of sinful disregard]
Mal 2:14 Yet ye say, Wherefore? [question #3] Because the LORD hath been witness between thee and the wife of thy youth, against whom thou hast dealt treacherously: yet is she thy companion, and the wife of thy covenant.
Mal 2:15 And did not he make one? Yet had he the residue of the spirit. And wherefore one? That he might seek a godly seed. Therefore take heed to your spirit, and let none deal treacherously against the wife of his youth.
Mal 2:16 For the LORD, the God of Israel, saith that he hateth putting away: for one covereth violence with his garment, saith the LORD of hosts: therefore take heed to your spirit, that ye deal not treacherously.
Mal 2:17 Ye have wearied the LORD with your words. [Who has been giving the words so far? The priests!] Yet ye say, Wherein have we wearied him? [question #4] When ye say, Every one that doeth evil is good in the sight of the LORD, and he delighteth in them; or, Where is the God of judgment? [question #5]
Still the priests. The priests led the people to do wrong by their actions. God disregarded their priestly sacrifices because of their abominations. All the questions are from the priests and the replies from God are to the priests.