how to make ToAddress field mandate in emailMessage object

Hello All,

I have done a trigger which make toAddress mandate. However it is not working my code is here. I checked in debug log is toAddress is blank then salesforce automatically assigns AdditionalTo to toAddress field. is there any way to make it mandate? .Thanks

trigger EmailRelatedToIsBlank on EmailMessage (before insert) {
for(EmailMessage eMsg : Trigger.new)
    {
		system.debug('---eMsg.ToAddress--' + eMsg.ToAddress);
		if(eMsg.ToAddress != null){
			
		}else{
			
			eMsg.addError('To Address can not be blank');
		}
			
    }
}

July 7, 2018
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Steven Nsubuga
trigger EmailRelatedToIsBlank on EmailMessage (before insert) { for(EmailMessage eMsg : Trigger.new) { system.debug('---eMsg.ToAddress--' + eMsg.ToAddress); if(eMsg.ToAddress == null || String.isEmpty(eMsg.ToAddress)) { eMsg.addError('To Address can not be blank'); } } }