Ben size toplantı biter bitmez e-posta göndereceğim.

Yes. In Turkish, göndereceğim already means I will send, so Ben is not grammatically necessary.

Here, Ben is optional and adds emphasis or clarity, a bit like:

• I will send it
• As for me, I will send it

So the sentence would still be correct as:

Size toplantı biter bitmez e-posta göndereceğim.

Size means to you or for you.

It comes from the pronoun siz, which can mean:

• you (plural)
• you (formal singular)

The ending -e / -a is the dative case, which often corresponds to English to.

So:

• siz = you
• size = to you

In this sentence, size shows the recipient of the email.

It can mean either:

• you all
• you in a polite/formal way to one person

Turkish uses siz both for plural you and formal singular you, so you need context to know which one is meant.

Literally, it is something like:

• the meeting ends ends-not

But as a fixed Turkish structure, X ...-er ...-mez means:

• as soon as X happens
• the moment X happens
• immediately after X happens

So:

• toplantı biter bitmez = as soon as the meeting ends

This is a very common Turkish pattern.

It comes from the verb bitmek = to end / to finish.

The form breaks down like this:

• bit-er = it ends / it will end in an aorist-style form
• bit-mez = it does not end / negative aorist form

Together, biter bitmez creates the idiomatic meaning as soon as it ends.

This pattern is used with many verbs:

• gelir gelmez = as soon as he/she comes
• duyar duymaz = as soon as he/she hears
• eve varır varmaz = as soon as he/she arrives home

So it is best learned as a set pattern.

Because toplantı is the subject of biter:

• toplantı biter = the meeting ends

So toplantı stays in its basic form, with no extra case ending.

If it had a different role, the form would change:

• toplantıyı = the meeting as a direct object
• toplantıda = in/at the meeting
• toplantıdan = from the meeting

But here the meaning is simply the meeting ends, so plain toplantı is correct.

Göndereceğim means I will send.

It comes from:

• göndermek = to send
• gönder-ecek = will send
• göndereceğ-im = I will send

So the ending -ecek / -acak is the future tense, and -im marks I.

Because of sound changes and vowel harmony, it appears as göndereceğim.

Turkish normally places the main verb at the end.

So this sentence follows a very typical Turkish order:

• Ben = I
• size = to you
• toplantı biter bitmez = as soon as the meeting ends
• e-posta = email
• göndereceğim = I will send

English word order is more fixed, but Turkish allows more flexibility. Even so, the verb very often stays last.

Because e-posta is the thing being sent, and objects usually come before the verb in Turkish.

So:

• e-posta göndermek = to send an email

This is the normal Turkish pattern: object + verb.

English says:

• send an email

Turkish usually says:

• email send

That is a very common question.

In Turkish, a direct object often takes the accusative ending only when it is specific/definite.

Here, e-posta is being used in a more general way, like an email rather than the email.

So:

• e-posta göndereceğim = I will send an email / I will send email
• e-postayı göndereceğim = I will send the email

Both are possible, but they mean slightly different things.

Yes, very naturally:

Size toplantı biter bitmez e-posta göndereceğim.

That is probably the more neutral everyday version.

Adding Ben makes the subject more explicit, often for emphasis, contrast, or clarity.

By itself, bitmez can indeed mean it doesn’t end or it won’t end, depending on context.

But in the pattern biter bitmez, it is not being understood literally in the normal negative sense. The whole expression works together as an idiom meaning:

• as soon as it ends

So it is better to recognize biter bitmez as one time-expression pattern rather than translating each part too literally.

Yes, Turkish word order is flexible, although some versions sound more natural than others.

For example, these are possible:

• Ben size toplantı biter bitmez e-posta göndereceğim.
• Toplantı biter bitmez size e-posta göndereceğim.
• Size e-posta toplantı biter bitmez göndereceğim.

The most natural version usually keeps the verb at the end and places the time expression before the main verb. Word order changes often affect emphasis rather than basic meaning.

E-posta is perfectly correct and common.

In casual speech, many speakers might also say:

• mail
• bir mail

So in everyday conversation, you may hear:

• Size toplantı biter bitmez mail atacağım.

That is more colloquial.
The original sentence with e-posta göndereceğim is clear, correct, and slightly more formal or standard.

A useful breakdown is:

• Ben = I
• size = to you
• toplantı biter bitmez = as soon as the meeting ends
• e-posta = email
• göndereceğim = I will send

So the structure is basically:

Subject + recipient + time clause + object + verb

That is a very typical Turkish sentence pattern.