<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;"><span style="font-family: LucidaGrande;">I've got calendarserver running under 10.7.4 and it works flawlessly except for external invitations. I've added a dedicated calendar user and setup imap/smtp settings per the documentation. </span><br style="font-family: LucidaGrande;"><br style="font-family: LucidaGrande;"><span style="font-family: LucidaGrande;">unknown calendar user address: </span><a href="mailto:validuser@domain.com" style="font-family: LucidaGrande;">mailto:validuser@domain.com</a><br style="font-family: LucidaGrande;"><span style="font-family: LucidaGrande;">error during PUT for </span><a href="mailto:validuser@domain.com" style="font-family: LucidaGrande;">mailto:validuser@domain.com</a><span style="font-family: LucidaGrande;">: Unknown recipient</span><br style="font-family: LucidaGrande;"><br style="font-family: LucidaGrande;"><span style="font-family: LucidaGrande;">I also tried with addressbook disabled but get the same error.</span><br style="font-family: LucidaGrande;"><br style="font-family: LucidaGrande;"><span style="font-family: LucidaGrande;">Checking SMTP logs I see not activity.</span><br style="font-family: LucidaGrande;"><br style="font-family: LucidaGrande;"><span style="font-family: LucidaGrande;">Any help is most appreciated.</span><br style="font-family: LucidaGrande;"><br style="font-family: LucidaGrande;"><span style="font-family: LucidaGrande;">Regards,</span><br style="font-family: LucidaGrande;"><span style="font-family: LucidaGrande;">Andy Knasinski</span><br style="font-family: LucidaGrande;"><span style="font-family: LucidaGrande;">NRG Software, LLC.</span></body></html>