Forgive me if I’m wrong but the advantages I can see: - load balancing / redundancy - failover - geoDNS
This would be for handling of incoming connections. I have no knowledge of apples infrastructure whether they are using geo-loadbalancer across multiple datacentres, whether their dcs are layer 3 or later 2 connected or how they operate in general although I suspect some of the points would be valid irrespective of how they have engineered their infrastructure and service. Scenarios: - maybe they want to perform maintenance at the dns level but only impacting one dns endpoint whilst keeping the other one available for client consumption. - maybe they want to perform maintenance on an external IP perspective that may only impact a subset of their internal hosted mail servers whilst keeping majority unaffected etc. - prob others To me it just gives them options to maintain reliability in terms of service uptime and availability. > On 3/05/2023, at 1:07 PM, Ken Peng via Postfix-users > <postfix-users@postfix.org> wrote: > > Hello > > iCloud mail has two MX RR: > > icloud.com. 3600 IN MX 10 mx01.mail.icloud.com. > icloud.com. 3600 IN MX 10 mx02.mail.icloud.com. > > But these two MX have the same IPs included. > > mx01: > mx01.mail.icloud.com. 300 IN A 17.42.251.62 > mx01.mail.icloud.com. 300 IN A 17.56.9.29 > mx01.mail.icloud.com. 300 IN A 17.57.152.5 > mx01.mail.icloud.com. 300 IN A 17.57.154.33 > mx01.mail.icloud.com. 300 IN A 17.57.155.34 > mx01.mail.icloud.com. 300 IN A 17.57.156.30 > > > mx02: > mx02.mail.icloud.com. 300 IN A 17.42.251.62 > mx02.mail.icloud.com. 300 IN A 17.56.9.29 > mx02.mail.icloud.com. 300 IN A 17.57.152.5 > mx02.mail.icloud.com. 300 IN A 17.57.154.33 > mx02.mail.icloud.com. 300 IN A 17.57.155.34 > mx02.mail.icloud.com. 300 IN A 17.57.156.30 > > > What's the advantage for this settings? Thanks. > > regards > Ken Peng > _______________________________________________ > Postfix-users mailing list -- postfix-users@postfix.org > To unsubscribe send an email to postfix-users-le...@postfix.org _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
