A computer-implemented method of handling a current email messaging campaign to be broadcast to increase a deliverability parameter regarding a percentage of the campaign which has been successfully delivered is described. The email messaging campaign comprises a plurality of email messages with the same message content and a plurality of different email addresses to send the message content to. The method is implemented on a processor and comprises: receiving feedback data relating to a delivery error arising from a previous email messaging campaign previously broadcast to a plurality of recipients; categorizing the feedback data into one of a plurality of categories to identify a type of error; selecting one of a plurality of predetermined corrective actions based on the category of the feedback data determined in the categorizing step; and dynamically and automatically modifying the current outgoing email messaging campaign which has yet to be broadcast using the corrective action chosen in the selecting step.