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Email Message exposes other user email ids
Sent email to my app users around 300. using topics. but when the user receives mail, in the to: all the other user mails also there. how to avoid this...?
TL;DR
Title: Sent email to app users but all email addresses are visible to recipients. How to fix?
Solution: Make sure to use the BCC field instead of the TO field when sending mass emails to conceal recipients' email addresses. 