code: public OvhTaskPop domain_account_POST(String domain, String accountName, String description, String password, Long size) throws IOException {
  		String qPath = "/email/domain/{domain}/account";
  		StringBuilder sb = path(qPath, domain);
  		HashMap<String, Object>o = new HashMap<String, Object>();
  		addBody(o, "accountName", accountName);
  		addBody(o, "description", description);
  		addBody(o, "password", password);
  		addBody(o, "size", size);
  		String resp = exec(qPath, "POST", sb.toString(), o);
  		return convertTo(resp, OvhTaskPop.class);
  	}
docs: Create new mailbox in server
  
  REST: POST /email/domain/{domain}/account
  @param accountName [required] Account name
  @param password [required] Account password
  @param description [required] Description Account
  @param size [required] Account size in bytes (default : 5000000000) (possible values : /email/domain/{domain}/allowedAccountSize )
  @param domain [required] Name of your domain name