<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi,<div class=""><br class=""></div><div class="">Calendar Server has a feature for exchanging calendar data via email ("<a href="http://tools.ietf.org/html/rfc2447" class="">iMIP</a>"). This can be used to schedule with people who don't have accounts on your server.</div><div class=""><br class=""></div><div class="">In Server.app, there's a checkbox sets the state of this feature: "Enable invitations by email". Turn it off and calendar server should stop trying to ping your email services.</div><div class=""><br class=""></div><div class="">For some detail about how this is configured, please see:</div><div class=""><a href="http://trac.calendarserver.org/wiki/FAQ" class="">http://trac.calendarserver.org/wiki/FAQ</a></div><div class=""><br class=""></div><div class="">Cheers,</div><div class="">-dre</div></body></html>