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
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