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What was your gateway product to open source?
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If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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Postfix! I worked at an E-commerce company that sent newsletters(spam) through shitty Windows SMTP servers. Looking for speed and some other neat things (DKIM and modify headers) I setup postfix on Debian and I guess this system is still running. Quickly after that I explored NGINX as a reverse proxy for yet again shitty Windows IIS webservers. This was my entry to open source and Linux in general.