Polarian via Postfix-users:
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> Hello,
>
> I understood RFC 5321 before hand, apologies for you having to type
> this all out, I feel bad now.
>
> But my point was, the documentation states that setting a preference is
> a risky action which could cause deliverability issues, the point of
> the mailing list was a "safe" way to keep IPv6 as a priority and then
> only using IPv4 as a fallback.
The purpose of Postfix is to deliver mail, not to achieve world
domination for a particular IP protocol.
If a destination has IPv4 and IPv6 addresses, then an explicit
preference for one protocol type means that ALL DELIVERIES will
suffer delays when that protocol type has an outage.
Whereas with Postfix default settings, about half of deliveries
will be slow when one of those protocols has an outage (Postfix is
smart enough to use similar numbers of IPv6 and IPv4 addressess,
to avoid huge delays when, for example, a site has many IPvX and
few IPvY addresses, and IPvX has an outage, for {X=4, Y=6} or {X=6,
Y=4}).
For me, availability matters more than protocol religion.
> The solution of using RFC 5321 to my advantage seems to be useful, but
> I am terrified that my email server will break, because that is how it
> is worded within the documentation, and it is what I am taking from
> Viktor's response, so I am really confused here.
>
> I do not want to risk having emails not being delivered, hence why I am
> asking for clarification on how it could go wrong.
It's a rather long explanation for "why not do X". like several
times longer than the text that explains what protocol preferences
do. And this is the only place where adding that text would help.
Wietse
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