2026-03-02 09:46:11 recipient verify defer (making calloout connection):
T=remote_smtp Network is unreachable
This is not a typo. Exim uses the term "callout" specifically for an
address (sender or recipient)
verification which performs an external access. See the documentation.
I think the double 'o' in 'calloout' is the typo. It was found and fixed
here:
https://code.exim.org/exim/exim/issues/3160
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