Context:
See OPT-3144 and https://confluence.camunda.com/display/CO/2020-07-07+Kick-off%3A+alerts+for+multiple+email+addresses

AT:

• must-have:
  • The user can add and delete multiple email addresses
  • Wrong email addresses should be marked as red + there is a message below the input field + the create alert button is disabled
  • the user guide is adjusted
• Should have:
  • Long email addresses are truncated and shown on hover
  • remove all email addresses at once
  • limit the number of email addresses
• Nice-to-have:
  • copy'n paste email addresses

Hint:

• design: https://app.zeplin.io/project/5b4f294ab0d5cf0c2c391d1d/screen/5eff4339a1e6dcb13e3c8c9a
• Shoud-have's and nice-to-have's can be postponed to the next release.