In this day and age where MailChimp and other email marketing services have become the norm, fewer people opt to use their own mailing list software such as phpList. SendGrid and other similar services can be easily integrated with EE through their API and they certainly have their own advantages.
Day 2 starts at the ExpressionEngine Conference in Detroit. Yesterday we heard from other agency owners how they manage sales, projects, retainers and relationships. Today we move into a more technical focus with talks on image management and workflow, git version control, moving data to the cloud and getting the most from ExpressionEngine 3.