Since mx1 and mx2 have the same IPs included, it's a waste to postfix's chosen space for IP addresses. For example, the 5 MX IPs could have 2 duplicates. So I am not sure why apple has this wasted setup.
Thank you. > > Ken Peng via Postfix-users: > > > > > 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. > > > > Whatever the motivation to do this, it does not matter for Postfix. > The Postfix SMTP client will randomly choose up to 5 IP addresses > from the combined list(*). Usually, some addresses will be a > duplicate, but most will be distinct. > > (*) By default, smtp_mx_address_limit = 5. > > Wietse > _______________________________________________ > Postfix-users mailing list -- postfix-users@postfix.org > To unsubscribe send an email to postfix-users-le...@postfix.org > -- https://kenpeng.pages.dev/ _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
