The GNU POP3 daemon is a small, fast, and efficient POP3 server. It is written with performance and RFC compliance in mind, and supports virtual domains (i.e. several domain names on the same server).
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The 0.9.11 distribution was missing the config.guess and config.sub files. A very old and rare bug has been found: simultaneous login to the same mailbox using the user home directory mailbox location might cause a glibc dump. It would overwrite about 4 KB of the beginning of the mailbox. However, GNU pop3d would recover all the remaining messages.