* -> Slack message
Mail -> Slack message
$ export SLACK_INCOMMING_WEBHOOK_URL=https://hooks.slack.com/services/XXXXXXXXX/XXXXXXXXX/XXXxxxXXXXXX
$ anyslk --listen-smtp --smtp-port=1025
Convert RCPT TO
address to Slack channel name
random@example.com -> Post message to #random channel
^^^^^^ ^^^^^^
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