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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I use PostSRSd. This implements Sender Rewriting Scheme. The envelope-FROM is rewritten to an address on your own domain — so recipients will look at your SPF record, not the original sender's record. Bounces back to that address are forwarded back to the original sender. The address includes a cryptographically-generated tag to prevent this send-bounces-back channel from being an open relay.
Regarding PostSRSd: I think that one would mess up my sieve scripts as it would rewrite all messages (as mentioned in its README). But from there I got to postforward, maybe I can integrate that one into my setup. I'm not entirely sure as I'm using MySQL as backend for the virtual aliases but I'll have a look.