* Put back sysinit scripts into the RPM package, so it can be built on RHEL
and Cent-OS without systemd.
* Do not allow an email address that begins with @
* Sqwebmail used an incorrect encoding when showing attachments' names, in
* Replace '''SOURCE_ADDRESS''' and '''SOURCE_ADDRESS_IPV6''' variables with
ipout and ip6out configuration files, which offer more functionality. The
outgoing IP address may be specified based on the IP address the sending
client connected to, to relay the message. A complete description in a new
section in the courier(8) man page.