Haraka: Error: socket hang up

Haraka version

2.8.9

node.js

v4.6.0

Observed behavior

[INFO] [D581ABCE-6FFB-44A6-A2F0-83A77D6DDC3D.1] [spf] identity=mfrom ip=216.27.63.138 domain="e.medalsofamerica.com" mfrom=<l7cf48ypokzmjoelkmyj1rzgtplsrjfm-b@e.medalsofamerica.com> result=Pass
[INFO] [D581ABCE-6FFB-44A6-A2F0-83A77D6DDC3D.1] [spf] scope: mfrom, result: Pass, domain: e.medalsofamerica.com
[NOTICE] [D581ABCE-6FFB-44A6-A2F0-83A77D6DDC3D.1] [core] sender <l7cf48ypokzmjoelkmyj1rzgtplsrjfm-b@e.medalsofamerica.com> code=CONT msg=""
[CRIT] [-] [core] Error: socket hang up
[CRIT] [-] [core]     at TLSSocket.onHangUp (_tls_wrap.js:1054:19)
[CRIT] [-] [core]     at TLSSocket.g (events.js:260:16)
[CRIT] [-] [core]     at emitNone (events.js:72:20)
[CRIT] [-] [core]     at TLSSocket.emit (events.js:166:7)
[CRIT] [-] [core]     at endReadableNT (_stream_readable.js:921:12)
[CRIT] [-] [core]     at nextTickCallbackWith2Args (node.js:442:9)
[CRIT] [-] [core]     at process._tickCallback (node.js:356:17)
[NOTICE] [-] [core] Shutting down
[NOTICE] [-] [core] worker 3 exited with error code: 1
[NOTICE] [-] [core] worker 10 started pid=29147

Steps to reproduce

Frequently incoming mail will cause the worker to bomb with this error.