يحظر صديقي مرسلا بعد رسالة تصيد.

A careful reading would be:

يَحْظُرُ صَديقي مُرسِلًا بعدَ رسالةِ تَصَيُّدٍ

Approximate transliteration:

yaḥẓuru ṣadīqī mursilan baʿda risālati taṣayyudin

Arabic usually leaves short vowels unwritten, so learners often have to infer them from grammar and context.

Because this is a verbal sentence in Arabic. In Modern Standard Arabic, a very common word order is:

verb + subject + object

So:

• يحظر = blocks
• صديقي = my friend
• مرسلاً = a sender

Natural English usually switches that to My friend blocks a sender.

Here يحظر means blocks or bans.

The verb حظر can also mean to prohibit or forbid, so the exact English translation depends on context. With things like users, accounts, or senders, يحظر is often best understood as to block.

Because the ending -ي means my.

So:

• صديق = friend
• صديقي = my friend

That suffix makes the noun possessed, and possessed nouns are automatically definite in Arabic.

From the sentence structure and meaning.

After the verb يحظر, the most natural reading is:

• صديقي = the subject, my friend
• مرسلاً = the object, a sender

So the sentence means My friend blocks a sender.

One thing that can confuse learners is that in normal unvocalized writing, صديقي does not visibly show its case ending, so context does a lot of the work.

Because it is the direct object of the verb يحظر.

The base word is مُرسِل = sender.
Here it is indefinite and accusative, so with full case marking it becomes:

مُرسِلًا

That -an ending is the normal accusative ending for an indefinite singular noun.

Literally, it means after a phishing message.

Breakdown:

• بعد = after
• رسالة = message
• تصيد = phishing

In smoother English, the intended sense is probably something like after receiving a phishing message or after seeing a phishing message.

Arabic sometimes leaves that kind of idea implied instead of stating it explicitly.

It is often taught that way for beginners, but more precisely بعد behaves like a time expression meaning after, followed by a noun phrase.

So:

بعدَ رسالةِ تصيّدٍ = after a phishing message

In traditional grammar, بعد is often analyzed as part of a construct relationship, which is why the following noun is in the genitive.

Yes. It works like an iḍāfa or construct phrase.

Literally:

رسالة تصيد = message of phishing

Natural English usually says:

phishing message

So the second noun narrows or explains the first noun.

Because both are being used indefinitely here:

• مرسلاً = a sender
• رسالة تصيد = a phishing message

Also, in an iḍāfa, the first noun normally does not take ال unless the whole phrase is definite in a different way.

It is understandable, especially in a digital-security context, and it is often written more clearly as تصيّد.

You may also see:

• التصيّد الإلكتروني = phishing
• رسالة تصيّد = phishing message

So the sentence is understandable, but in polished modern tech Arabic, writers often use تصيّد more explicitly.

It is understandable, but it is a bit compact.

A more explicit version would be:

يحظر صديقي مُرسِلًا بعدَ تلقّي رسالةِ تصيّدٍ

That means:

My friend blocks a sender after receiving a phishing message.

This version makes the implied idea of receiving the message more explicit, which sounds more natural to many learners.