After some consultation with my colleagues, your answers to your questions are as follows:

1. If your immediate boss or a superior doesn't accept your resignation letter, you can proceed to serve it on the HR Dept. Read back your contract, I am doubtful you need 3 superiors to be present to discuss your resignation from the company. Follow what is stated in your contract, if it only mentions you have to give 1 month notice to terminate your contract than 1 month notice would be more than sufficient.

Further to the above, I am doubtful a company can avoid or stop a person from resigning from a company should he/she choose to do so. So pass your resignation letter to HR Dept and have someone "Acknowledge receipt" [very important!!] and wait out your 1 month.

2. I just enquired with my colleague (who does IR/Employment related stuff) a release letter is not a must, if u have it, it just formalizes your termination but nothing more than that. If you don't have it, it won't jeapordize your career. So your termination letter will be very important to evidence that you had resigned from the company from your own chooosing and not because your left cause you were sacked or gone AWOL (leave without reason and joined another company).

3. Like i said in items 2. release letter isn't that important as it sounds [unless I may be wrong], so once you give your notice of 1 month and you have worked until the effective date of your termination your free to go.

4. Now I will not recommend anyone to send resignation by email or to send a hardcopy to your boss when your boss is not around:

To give ur resignation leave it on his desk when his not around=
a) Rude.
b) May create even more tension.
c) burning bridges.
d) no acknowledgement

Unless your absolute sure that handing in your resignation when your boss is not around is a good idea, I suggest that this mode be the very very very last option or avenue.

Email=
a) no one acknowledgement (might go into junk folder who knows.)

It's advisable if your not seeing eye to eye with your boss or ur boss is being an a$$ or for whatever the reason is, just give your termination letter to HR Dept. Make sure again that they acknowledged it so that your notice of termination will be effective the moment someone acknowledges and receives your letter.

----

Problems?

I foresee only one issue, the company withold your salary on the grounds your termination wasnt valid. It's only the money issue will hold you back and they can threaten you with, thats why getting your termination letter & observing the terms of your employment contract is very important.