InfoPath: Write and format email addresses from a multi value contact selector

1. Create a new text field in your InfoPath form
2. Set the default value using xPath as: xdMath:Eval(xdMath:Eval(../../my:FinalProjectDetails/my:VolunteerNames/pc:Person, ‘concat(substring-after(pc:AccountId, “membership|”), “; “)’), “..”)

my:VolunteerNames = My people picker name