[Dovecot] discarding vacation response for message implicitly delivered

Hi All,

Spec:

• Centos 6.3x64
• postfix-2.6.6-2.2.el6_1.x86_64
• dovecot-pigeonhole-2.0.9-5.el6.x86_64
• dovecot-2.0.9-5.el6.x86_64

Challenge: Does anyone have an explination regarding this message?

"Mar 22 12:15:22 chtvm dovecot: lmtp(7004, cht): C+EZBuObS1FcGwAAlnPEfg: sieve: msgid=20130322011522.6D55D40389@chtvm.noboost.org: discarding vacation response for message implicitly delivered to cht@vacation.noboost.org"

I'm getting it when passing traffic through to the Dovecot sieve vacation extension from a virtual domain.

Regards,

Craig