IPv6 Network - Mail Clients - Unlike its cousin Internet Explorer, Microsoft Outlook Express doesn’t support IPv6. Many of the UNIX/Linux mail clients, such as Thunderbird under Linux, are fully IPv6-enabled. Like Firefox, Thunderbird supports IPv6 under Windows, too, but not on the Mac. But unlike Firefox, there doesn’t seem to be a way to enable IPv6 when it’s disabled or disable it when it’s enabled. However, Apple’s Mail application has IPv6 on board and prefers the new protocol over IPv4.1 But despite the fact that Mail will happily work over IPv6, it won’t function when the system doesn’t have an IPv4 nameserver configured. Actual IPv4 connectivity to the mail server or the rest of the world isn’t required, but without an IPv4 DNS address, Mail won’t connect to the mail server. If you want to run Apple Mail in an IPv6-only network, add 127.0.0.1 as an additional DNS server in your network settings, and Mail will work without trouble.

You may run into problems sending email over IPv6 with Mail 2.0, the version that comes with MacOS 10.4 Tiger. The easiest way to work around this is to configure Mail with an SMTP hostname that only has an A record in the DNS.

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