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
Sometimes, a user may have a malformed email such as `test@test.com<mailto:test@test.com` their email address, and as a topic participant will be included as a CC email when sending a GroupSmtpEmail. This causes the CC parsing to fail and further down the line in Email::Sender the code to check the CC addresses expects an array but gets a string instead because of the parse failure. Instead, we can just check if the CC addresses are valid and drop them if they are not in the GroupSmtpEmail job.