This is a development build of Courier.

Download: http://www.courier-mta.org/download.php

Changes:

• Cleanup of the internal DNS resolver. Get rid of the default global instance, force explicit instantiation and destruction of the resolver object. Add support for DNSSEC, not used for anything, right now.

I'd like to make a small request, if you have a few spare minutes. Download and compile this build. You do not need to install it, just run "testmxlookup" that gets built in the courier subdirectory, like this:

testmxlookup -dnssec <domain>

You should get back a list of MX records for the specified domain, as usual. In the event that someone does happen to have working DNSSEC, each IP address in the list will be also marked with "(DNSSEC)", but that's not important, as long as the list of MX IPs is returned at all.

This is to gauge the percentage of population with DNS servers that can't talk to DNSSEC-enabled clients. In the event that the "-dnssec" option doesn't work, also try:

testmxlookup -dnssec -udpsize 512 <domain>

• Ignore errors received in response to a STARTTLS request, by default, if the non-encrypted connection can still be used. Sad state of TLS with SMTP. Provide an option to revert to previous, hard-line behavior. Provide a hook to run an external script to report a peer that fails a STARTTLS.

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