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USE flags

• idn - Enable support for Internationalized Domain Names
• kerberos - If network is enabled, this adds support for GSSAPI login on IMAP through virtual/krb5.
• net - Enable support for network protocols (POP, IMAP and SMTP). If you only need to send mail with the local Transport Agent, disabling this will get you support for only /usr/sbin/sendmail call.
• split-usr - Enable behavior to support maintaining /bin, /lib*, /sbin and /usr/sbin separately from /usr/bin and /usr/lib*
• ssl - If network is enabled, this adds support for S/MIME and SSL/TLS-powered protocols through dev-libs/openssl.