As pointed out by Mr. John, the recruitment process does not end with merely selecting the candidates but has to be backed with an Organisational Culture where individuals are valued and dealt with as human beings. Once the candidate is issued a Welcome Mail, there has to be follow-up emails regularly updating about the organizational developments, inquiring about well-being, travel arrangements, family commitments, weather & climate of the city (if the candidate is from outstation), possible accommodation help, day-to-day commutation to the workplace, the availability of food items, the scope for employment of a spouse, children's education, medical facilities locally available, etc.
Send regular capsules of information so that the candidate develops an affiliation feeling even before joining. The organization has to have a strong work culture emphasizing the worth of employees, giving sufficient opportunity for growth, and proving self-worth. Today the organization cannot take its employees for granted; there is no dearth of opportunities for the talented. So there has to be a conscious attempt to develop policies and programs to keep employee engagement at a high level. Merely paying a good salary is not enough. HR has to render the employee experience to be worthwhile. Remember, 'people leave the organization not for a higher salary but for poor bosses'.