GetCompanyID.groovy

import com.liferay.portal.kernel.exception.PortalException
import com.liferay.portal.kernel.model.User
import com.liferay.portal.kernel.service.UserLocalServiceUtil

try {
  // You can replace 'userId' with the actual user's ID
  def user = UserLocalServiceUtil.getUser(44386)
  def companyId = user.getCompanyId()
  println "Company ID for User ${user.getScreenName()}: $companyId"
} catch (PortalException e) {
  e.printStackTrace()
}

TestMail.groovy

import javax.mail.internet.InternetAddress;
import com.liferay.mail.kernel.model.MailMessage;
import com.liferay.mail.kernel.service.MailServiceUtil;

// from
InternetAddress from = new InternetAddress();
from.setAddress("[email protected]");

// to
InternetAddress to = new InternetAddress();
to.setAddress("[email protected]");

MailMessage mailMessage = new MailMessage(from,to,"bujsub","body body",Boolean.TRUE);
MailServiceUtil.sendEmail(mailMessage);