dictionary completion for words including `@' sign

I don't only want to enjoy autocomplete of my contacts when in gmail, but also
for my mutt.

I have a file with all my email addresses and
set dict=emails.txt.

When I complete with dictionary completion (mapped to <tab>), then I only receive
the first part of the email addresses, like,

foo<tab>
foo.bar

How do I return
foo<tab>
foo.bar@baz.com

And if I go.
<tab>
it expands to
foo.bar
baz

Here are one of the many settings of isfname, that I tried, all
without a breakthrough;
set isfname=@,48-57,/,\\,.,-,_,+,,,#,$,%,{,},[,],:,@-@,!,~,=

what gives?

Eric

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