Thanks for the extremely fast and helpful replies!

> Perhaps I'm missing something, but ISTM check_recipient_access would
> do the trick?
No, stupid me was missing that.

> A similar result can be achieved with transport_maps
> 
> /etc/postfix/main.cf:
>     transport_maps = hash:/etc/postfix/transport
> 
> /etc/postfix/transport:
>     [email protected]   retry:450 migration in progress
So that will queue the mail until the next delivery attempt after I remove 
the entry?

> Just for completeness, a check_recipient_access 'hold' action would
> accept a message for that recipient and freeze it in the queue until
> it is released with the postsuper -H option.
That would seem like the best solution to me. Is that documented anywhere?

> This does not scale to large numbers of messages, though.
That's not a problem. It's just a handful of users at a time and migration 
shouldn't too long.
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