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Email Invalid Cause vs. Email Address

Question asked by 4aeede567035311eef2cb63cd04f7b9238be7873 on Mar 15, 2018
Latest reply on Mar 15, 2018 by Grégoire Michel

In the email invalid cause field, it shows the invalid cause such as 550 <> No such user here. However, the email address in this field does not match the email address that I have for the person. I was thinking that maybe the email address had been updated in SFDC or Marketo, but I cannot locate any record of the email address being updated in SFDC or the record's activity history. I know for some emails, they have an alias, so is it possible that the alias is being populated into the email invalid cause instead of the actual email I am sending to? Or why isn't the email change, if there was one, showing up in the record's activity history?