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WSL2 cannot connect to localhost when the service is running on Windows · Issue #5211 · microsoft/WSL · GitHub
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smtp localhost port 25 hardcoded in post-build publisher · Issue #169 · groupon/DotCi · GitHub
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Connection refused - connect(2) for "localhost" port 25 · Issue #137 · mailjet/mailjet-gem · GitHub
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codeigniter - mail(): Failed to connect to mailserver at "localhost" port 25, verify your "SMTP" and "smtp_port" setting in php.ini or use ini_set() - Stack Overflow
Implementing a stand alone Email Server - Getting Started with Apache James - AMIS, Data Driven Blog - Oracle & Microsoft Azure
