| An MTA designed specifically for maildirs | |
| https://www.courier-mta.org/ | |
| courier-1.3.5 | GPL-3 |
| download~alpha amd64 ~arm ~hppa ~ia64 ~ppc ppc64 ~riscv ~s390 sparc x86 | gentoo |
| courier-1.2.3-r1 | GPL-3 |
| download~alpha amd64 arm ~hppa ~ia64 ~ppc ppc64 ~riscv ~s390 sparc x86 | gentoo |