Quote:
Originally Posted by placebo
On Fastmail, you can set multiple delivery targets for your email address, including an external account. If the message is reaching the MX server, it should be forwarded to the external address.
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I second the suggestion to try this. If you then receive the message at another mail account, it will confirm that Fastmail's MX server is seeing the message, and it will also provide a raw message for you to examine for clues. You can also then give the message to Fastmail support and they surely must then be able to track down the problem.