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Testing SMTP over IPv6

> If you are mixing IPv4 & IPv6 servers in the MX list,  it is important that
> the MX list be set in the following manner...
> IPv6 only servers		MX    a
> IPv6 + IPv4 servers		MX    b
> IPv4 only servers		MX    c
> Where a < b < c

No, this sort of ordering is only important if not all the servers
can do "final delivery" (i.e., take the message out of the SMTP