> Thanks Arno for your reply, but DNS allows routing the MX recods and in this > case it may work the way you told. The problem starts when the machine where > a James instance is running goes down. A Load Balancer switch inmediatly to > the rest of James instances avoiding the one down, but with the DNS when a > machine is down the IP of the machine that is going to process the MX > records should propagate along DNS hierarchy and it takes time that we can > not assume.
Jose, You are not quite right... DNS MX records are *not* the same as A or CNAME records, a mail server attempting to deliver mail to a domain will try one from the list, if that machine does not respond the sender will immediately try another one, and so-on until it either suceeds or runs out of options. High availability can be achieved in this way. Setting up one or more james instances as incoming SMTP gateways forwarding their mail to a single James instance gives you a cluster of public facing machines which can cope with outages of the real mail processing instance they are forwarding to. http://wiki.apache.org/james/SmartOrSecondaryHost Outgoing mail can be load balanced by using a db repository shared between multiple instances of James. We are hoping to recieve a donation of code to perform distributed locking, but James works OK without it in most cases. d. *************************************************************************** The information in this e-mail is confidential and for use by the addressee(s) only. If you are not the intended recipient (or responsible for delivery of the message to the intended recipient) please notify us immediately on 0141 306 2050 and delete the message from your computer. You may not copy or forward it or use or disclose its contents to any other person. As Internet communications are capable of data corruption Student Loans Company Limited does not accept any responsibility for changes made to this message after it was sent. For this reason it may be inappropriate to rely on advice or opinions contained in an e-mail without obtaining written confirmation of it. Neither Student Loans Company Limited or the sender accepts any liability or responsibility for viruses as it is your responsibility to scan attachments (if any). Opinions and views expressed in this e-mail are those of the sender and may not reflect the opinions and views of The Student Loans Company Limited. This footnote also confirms that this email message has been swept for the presence of computer viruses. ************************************************************************** --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
