Learn Farsi: هر مدیر باید دستورالعمل جدید را از طریق نامه‌ی رسمی ابلاغ کند. - Every manager must communicate the new guideline via an official letter.

The phrase az tarigh-e means via or through the channel of and is much more formal and precise than bâ (with). It perfectly fits the bureaucratic context of this sentence. Remember that it requires an Ezafe (the -e sound) to connect to the noun that follows it.

Why does the word for guideline, dastur-ol-amal, have an -ol- sound in the middle?

This word combines dastur (instruction) and amal (action), linked by the Arabic definite article al, which is pronounced as ol in Farsi. You will see this connector in many formal administrative terms borrowed from Arabic.

Why is the object marker râ placed after jadid and not directly after the noun?

The specific object marker râ always comes at the very end of the entire noun phrase. Because the object is the full phrase meaning the new guideline (dastur-ol-amal-e jadid), the marker must follow the adjective rather than the noun itself.

Why is the verb eblâgh konad rather than eblâgh mikonad?

The sentence uses the modal verb bâyad (must), which requires the following verb to be in the subjunctive mood. While the subjunctive usually adds a be- prefix, compound verbs like eblâgh kardan (to communicate) often drop it, leaving us with just the subjunctive stem .