Hello Wietse,

..thanks for the prompt answer. My problem, however, remains:

> > What I want to happen is that in the first step, all addresses
> > of the form userhost.domain1 are converted to userdomain1 and
> > in a second step, userdomain1 is converted to userdomain2.
>
> Canonical maps can do that for you already.
>
> host.domain1 domain1
> domain1 domain2

But wouldn't that require clones of the first line for every
host in domain1?

> Use a regexp based canonical map if necessary.

Though I thought I had RTFM I didn't find any documentation
on that feature. Sounds like excactly what I'm looking for.

> For more specific
> hints, you need to give more specific examples.

I have lots of hosts in domain1 and need all the From-haders
rewritten from <anyuser><anyhost>.domain1 to <anyuser>domain2.

In Perl-style my sender_canonical would read
s/(\w+)(\w+)\.domain1/$1.domain2/

TIA,
--Andreas

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