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Did you install greylisting and blacklisting? It really do reduce spam to ~0, and is a one time 5-20m configuration.

As for hotmail, I strongly remember doing a telnet to hotmail servers and succeeded in sending emails while writing commands by hand on my private computer. Thus without any special headers or other magic, I could send email without any issues. It would had been interesting to hear details on why hotmail rejected your emails. Default postfix installation?




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