FIXED – Nintex Workflow “The specified string not in the form required for an e-mail address”
Recently I came across this error, could not find a resolution on discussion boards, and wanted to share.
When using multiple Workflow Variables (TO, CC, CC2, CC3) with Send Mail action, you should NOT have any semi colon at the start or end of each string variable.
Feel free to reference multiple Workflow Variables when composing Send Mail action, but be sure to truncate recipient values neatly with semi-colons ONLY between values, and never at the prefix or suffix.
Cheers!

Bad Values (Leading or Trailing)
“jdoe@company.com; user2@company.com;”
“;jdoe@company.com; user2@company.com;”
“;jdoe@company.com; user2@company.com”
Good Values (Between Only)
“jdoe@company.com; user2@company.com”
Screenshot

