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Some Beeper users say Apple banned their Macs from iMessage
(9to5google.com)
This is a most excellent place for technology news and articles.
Read receipts are just a way to incite social strife.
You can usually turn those off. Not sure if you can turn them off for SMS, I remember text messages having those
Farthest I've seen regular text messages go is received receipts. And that depends on the provider, some of them only return up to "sent".