Support @silent to not notify the recipient of the message
Often times I want to message someone after hours so as to not forget the next day, but avoid doing so because it is rude. An "@silent" message will allow me to send that message without alerting the recipient.
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Josua Müller commented
Second this.
We have channels where some people have notifications for every message since they have to react to most of the chat in there, having the ability to silence notifications from the senders side would make it able to add more info/replies to one of the messages without alerting everyone all the time.
Or it's weekend and i found something interesting that i want to share but not notify people over, because it's off topic and i don't know if someone gets notifications for all messages in that channel.
etc. etc. etc.