Hi,
The problem you are facing has become very common in IT industries. Earlier, employers used to terminate the services of workers, and the workers used to approach Labour Courts. However, these days it has become difficult to retain qualified employees.
Regarding your first question, I have to say that in case of a breach of the service agreement, initially, a legal notice should be issued to the concerned employee stating the losses the company had to incur due to the breach of the service contract and the details, if any, incurred by the company to train him, etc. If the employee does not reply to the notice or replies to the notice but refuses any liability, then the company can approach the Civil Judge, Senior Division (depending upon the amount claimed) by filing a suit for damages and compensation. Though a company cannot bind a person to serve (bonded labor not permissible), the company can ask the employee to compensate it for the loss he has caused to the company by breaking the contract. Certainly, sufficient documentary evidence has to be produced to the Court to prove the loss.
Regarding your second query, I have to say that merely because he has emailed you that he is leaving the organization does not mean the employer-employee relationship between your company and him has severed. He is legally still in your employment. He has not used the word resignation, and the company hasn't accepted any resignation. You mark him absent on the muster roll, and after some period, you can send him a legal notice claiming damages incurred by the company due to his unauthorized absence (documentary proof necessary). You can also send a legal notice to the company in which he has newly joined, stating that he cannot join that company as he is still in your employment. Certainly, the terms and conditions in his appointment letter/service contract with you will have to be seen. However, if you want to finish off the matter at this juncture, I can say that you may deduct the amount due to the company towards his notice period from his terminal dues if any.
I hope I have made myself clear. If any further clarification is deemed necessary, I shall be glad to be at your assistance.
S.M. Paranjape, Advocate