For some very good reason you might would like to setup a 'autoreply' only account, without storing the incoming mail into a mailbox. If not already done, create an account via Delegated Admin Gui or commadmin Commandline Tool.
/opt/sun/comms/da/bin/commadmin user create -D admin -d vmdomain.tld -w enigma -F Mike -l
mparis -L Paris -W tester -E Mike.Paris@vmdomain.tld -S mail -H mars.vmdomain.tld
Setup mailDeliveryOption to autoreply mode only, so no email will be stored in the user mailbox, skip this step if you want incoming emails stored in the mailbox.
ldapmodify -D "cn=Directory Manager" -w enigma -f /tmp/modfile
Setup mailSieveRuleSource with the autoreply text and 'do-not-reply' From address. The "Thank you ..." part becomes the subject. The next string in quotes is the body part of the message. The ":hours 0" denotes that we want a reply sent for every message. Finally, the \n is used because of the wanted newlines in the body.
ldapmodify -D "cn=Directory Manager" -w enigma -f /tmp/addfile
mailSieveRuleSource: require "vacation"; vacation :hours 0 :reply :from "do-not-reply
@domain.com" :subject "Thank you for contacting webpost" "Your Mail is being review
ed.\nTo access contact information please visit : http://www.domain.com \nPlease do
not reply to this e-mail as it is an automated response on your mail being accessed
.\n\nPublic Respose Unit.\n"