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Postfix Documentation
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Known Limitations

  • The order of IPv6/IPv4 outgoing connection attempts is not yet configurable. Currently, IPv6 is tried before IPv4.

  • Postfix currently does not support DNSBL (real-time blackhole list) lookups for IPv6 client IP addresses; currently there are no blacklists that cover the IPv6 address space.

  • IPv6 does not have class A, B, C, etc. networks. With IPv6 networks, the setting " mynetworks_style = class" has the same effect as the setting " mynetworks_style = subnet".

  • On Tru64Unix and AIX, Postfix can't figure out the local subnet mask and always assumes a /128 network. This is a problem only with " mynetworks_style = subnet" and no explicit mynetworks setting in main.cf.

Postfix Documentation
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