Hi Michael, We use a solution with 2 loadbalancers in front of 3+ postfix servers All MX records ( for around 100 domains ) are directed to the same address - the address of the loadbalancers. Based on statistics for each server the mail is redirected to one of the 3-6 postfix servers we have running. Statistics for each server is written to Our Mysql Backend cluster where all postfix related files are located
As long as just one postfix server is running - mail is in function. We are able to add more servers on the fly depending on load. Best regards Peter Sørensen/Univ.Of.South.Denmark/email:mas...@sdu.dk Fra: owner-postfix-us...@postfix.org [mailto:owner-postfix-us...@postfix.org] På vegne af Michael Maymann Sendt: 27. december 2011 08:47 Til: Postfix users Emne: Re: Loadbalancing+failover solution Hi All, Wietse: thanks for your replies - and sorry for not really knowing what I'm asking...:-) I guess my question is regarding receiving mail to PostFix: Linux servers->PostFix. is "DNS RoundRobin" or "MX record with equal value" preferred thanks in advance :-) ! ~maymann 2011/12/23 Wietse Venema <wie...@porcupine.org<mailto:wie...@porcupine.org>> Wietse: > According to these: > > http://www.postfix.org/postconf.5.html#smtp_mx_address_limit > http://www.postfix.org/postconf.5.html#smtp_mx_session_limit > > The Postfix SMTP client will try at least five IP addresses or two > SMTP sessions, When it reaches either limit, Postfix will > try another delivery later for several days. > > The retry schedule behaves as documented at: > > http://www.postfix.org/TUNING_README.html#hammer Michael Maymann: > Hi Wietse, > > thanks for your nice comments. > > I guess what you mention is valid for "my internal postfix relay > server"->"ISP mailserver" - or am I mistaken ? What I write is valid for the Postfix SMTP client, whether it sends mail to your ISP, or to your internal mail server. Wietse
