Another immensely popular tool for team, including open-source dev and user teams is slack - https://slack.com/ HipChat is a alternative - https://hipchat.com/
Host it yourself Slack-alikes using open-source include http://www.mattermost.org/ and https://www.zulip.org/ These of these tools mentioned give plenty of integrations, including to iPhone/Android apps or gateways to email. Gooling for "slack spam' I found https://loganix.net/how-we-use-slack-to-beat-down-referral-spammers/. Not so much about email, but the guy's business was having faked HTTP-referrers (for some reason) and he'd written a slack-bot to purge such data from his backends. - Paul Hammant
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