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must be different alternative
sms message
Email is the best way to circulate an emergency official information. Train your staff to be updated through emails and communicate through it.
Thanks for Invitation:
My answer is:
1) Having two way communication is important the sender should be able to send and receive the message.
2) Sending Mass Emails.
3) SMS is one of the form of communication.
4) Information can be given through company intranet.
5) Last but not the lease an Emergency Alarm.