بعد ما خلص الاجتماع، رديت عالايميل.

Here بعد ما means after in the sense of after something happened.

So:

بعد ما خلص الاجتماع = after the meeting ended

In Levantine, بعد ما + past verb is a very common pattern.

In this sentence, ما is not a separate not. It is part of the common expression بعد ما.

A good way to learn it is as one chunk:

• بعد
  • noun = after
• بعد ما
  • verb/clause = after

For example:

• بعد الاجتماع = after the meeting
• بعد ما خلص الاجتماع = after the meeting ended

Literally, it is the meeting finished or the meeting ended.

Here:

• خلص = finished / ended / was over
• الاجتماع = the meeting

So the meeting is the thing that ended.

Because Arabic often uses verb + subject word order, especially in narration.

So:

• خلص الاجتماع = literally ended the meeting
• natural English = the meeting ended

You could also hear:

• الاجتماع خلص

That means the same thing, but with the subject first.

Here it is being used intransitively, so it means ended / was finished.

So خلص الاجتماع does not mean someone finished the meeting. It means the meeting itself ended.

That is a very normal use of خلص in Levantine.

رديت means I replied or I answered.

The ending shows first person singular in the past, so it corresponds to I.

So:

• رديت = I replied

This is a very common kind of past-tense form in Levantine.

Because the verb is really pronounced with a doubled د sound, so ردّيت is a more explicit spelling.

In everyday typing, people often leave out the shadda, so you will very often see:

• رديت

But more carefully, it can be written:

• ردّيت

Both represent the same word here.

Because in Levantine, ردّ على is the normal pattern for reply to someone or something.

So:

• ردّ على الإيميل
• ردّيت عالايميل

both mean replied to the email

This is just the preposition the verb normally takes, much like English uses to in reply to.

عالايميل is a spoken-style spelling of على الإيميل.

In fast speech:

• على often becomes عَ
• عَ + ال becomes عالـ

So:

• على الإيميل
• عالإيميل
• عالايميل

can all represent the same basic phrase in colloquial writing.

It means to the email or, more naturally in English, to the email / the email after reply to.

Yes. إيميل / ايميل is a loanword from English email, and Arabic speakers treat it like a normal noun.

So it can take الـ:

• إيميل = an email / email
• الإيميل = the email

In this sentence, الايميل suggests a specific email that is already known from context.

Yes, this feels natural and colloquial in Levantine.

A few other natural ways to say something similar are:

• بعد الاجتماع، رديت عالإيميل
• لما خلص الاجتماع، رديت عالإيميل

These are all close in meaning, but:

• بعد ما strongly gives the sense of after
• لما is more like when

Also, the spelling عالايميل is clearly colloquial rather than formal written Arabic.

A rough pronunciation would be:

baʿd ma kheleS il-ijtimāʿ, raddēt ʿal-īmēl

Two sounds that are often hard for English speakers:

• خ in خلص: like the sound in Scottish loch or German Bach
• ع in عالايميل and اجتماع: a deep throat sound with no exact English equivalent

If you cannot produce ع yet, it is still better to notice that it is a real consonant and not just a silent vowel.