wait-for-email-to 283 Bytes
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#!/bin/sh

set -eu

to="$1"

waited=0

while [ $waited -lt 10 ]; do
  if (sudo postqueue -p | grep -q "$to"); then
    sudo postqueue -p | grep -c "$to"
    exit
  fi
  sleep 1
  waited=$(($waited + 1))
done

echo "E: no message for $to arrived at the mail realy" >&2
echo 0
exit 1