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Error: SendEmail failed. First exception on row 0; first error: INVALID_ID_FIELD, WhatId is not available for sending emails to UserIds.

I want to send email through the snippet in below.

List < Messaging.SingleEmailMessage > mailList = new List < Messaging.SingleEmailMessage > ();
Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
mail.setTemplateId('00XJ0000000mq21MAA');//Email Template is
mail.setTargetObjectId('005J00000076xlj');//Contact,lead or userid to be specified.
mail.setWhatId('a03J000001Dc6vPIAR');//Custom object id
mail.setSaveAsActivity(false);
mailList.add(mail);
Messaging.sendEmail(mailList);

It is throwing above exception when I pass userId inside setTargetObjectId.

mail.setTargetObjectId('005J00000076xlj');

It is working fine when I pass contactId or leadId.

Please help me to send email to UserId

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setWhatId is only available when in setTargetObjectId we specify Lead or contact Record ID.

So you are getting the expected behavior.

There is one workaround which I use. In setTargetObjectId give any dummy contact ID. SetToaddress method pass the UserId. And then set the setTreatTargetObjectAsRecipient(false) to false. So your contact won't receive the email.

  • no i still get the SendEmail failed. First exception on row 0; first error: INVALID_CROSS_REFERENCE_KEY, invalid cross reference id: [] – compski Dec 4 '19 at 14:35
  • @compskiI suggest you to create a new question and add details there. – Tushar Sharma Dec 4 '19 at 16:44
  • sure check this out salesforce.stackexchange.com/q/287192/38191 – compski Dec 4 '19 at 16:46

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