escape: ${escape:B7·F2ò}
****
# Checkout expansion debugging
-exim -d-all+expand -be
+exim -d-all+expand -f sndr@dom -be
primary_hostname: $primary_hostname
+sender_address: $sender_address
match: ${if match{abcd}{\N^([ab]+)(\w+)$\N}{$2$1}fail}
match: ${if match{wxyz}{\N^([ab]+)(\w+)$\N}{$2$1}fail}
${if eq {1}{1}{yes}{${lookup{xx}lsearch{/non/exist}}}}