Generate really bad (non compliant) random email addresses, separated by commas

Random.cpp

#include <stdlib.h>
#include <string.h>
#include <stdio.h>

void RandEmail(char  *pass);

int main()
{

	FILE *fp = NULL;
	fopen_s(&fp, "c:/temp/rand.txt", "w");
	char pass[256];
	for (int i = 0; i < 300000; i++)
	{
		RandEmail(pass);
		strcat_s(pass, ",");
		fwrite(pass, strlen(pass),1, fp);
	}
	fclose(fp);
	return 0;
}

void RandEmail(char*  pass)
{
	int i;
	for (i = 0; i < 12; i++)
	{
		if (i == 8)
			pass[i] = '@';
		else
			pass[i] = rand() % (122 - 97 + 1) + 97;
	}
	pass[i] = '\0';
}