It is possible to specify a custom sender domain in the "From:"-header of a user's vacation message. If this custom sender Domain is not registered as a valid primary or secondary domain in SME server-manager, chances are that remote SMTP servers will reject the vacation message (550 envelope sender not allowed). | It is possible to specify a custom sender domain in the "From:"-header of a user's vacation message. If this custom sender Domain is not registered as a valid primary or secondary domain in SME server-manager, chances are that remote SMTP servers will reject the vacation message (550 envelope sender not allowed). |