Some ideas for s/qmail future features
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Cleanups:
- srs2.c refactoring.
- qmail-ldapam.c refactoring and integration. (separate package)
- maildir++ patch inclusion? (done)

Extensions:
- QMQ integration.
- DKIM API. (done)
- GUUID instead inodes for queue files.
- SMTP pipelining for delivery.
- Native IDN2 support.