diff --git a/install_postfix_advanced.sh b/install_postfix_advanced.sh
index 009625e..70b2517 100755
--- a/install_postfix_advanced.sh
+++ b/install_postfix_advanced.sh
@@ -631,6 +631,19 @@ alias_maps =
 alias_database =
    hash:/etc/aliases
 
+## - Optional address mapping lookup tables for envelope and header sender 
+## - addresses. The table format and lookups are documented in canonical(5).
+## -
+## - Example: you want to rewrite the SENDER address "user@ugly.domain" 
+## - to "user@pretty.domain", while still being able to send mail to the 
+## - RECIPIENT address "user@ugly.domain".
+## -
+## - Note: \$sender_canonical_maps is processed before \$canonical_maps.
+## -
+sender_canonical_maps = btree:/etc/postfix/sender_canonical
+
+
+
 ## - Optional lookup tables with mappings from recipient address 
 ## - to (message delivery transport, next-hop destination). 
 ## - See transport(5) for details. 
@@ -1270,6 +1283,19 @@ else
    echo_failed
 fi
 
+echononl "   Create file \"sender_canonical\""
+if [[ ! -f /etc/postfix/sender_canonical ]]; then
+	cat <<EOF > /etc/postfix/sender_canonical
+@localhost  @$(hostname -f)
+EOF
+fi
+postmap btree:/etc/postfix/sender_canonical
+if [[ $? -eq 0 ]] ; then
+   echo_ok
+else
+   echo_failed
+fi
+
 echononl "   Create file \"transport\""
 if [[ ! -f /etc/postfix/transport ]]; then
 	cat <<EOF > /etc/postfix/transport
diff --git a/install_postfix_base.sh b/install_postfix_base.sh
index b87a02b..b68ec97 100755
--- a/install_postfix_base.sh
+++ b/install_postfix_base.sh
@@ -568,6 +568,17 @@ alias_maps =
 alias_database =
    hash:/etc/aliases
 
+## - Optional address mapping lookup tables for envelope and header sender 
+## - addresses. The table format and lookups are documented in canonical(5).
+## -
+## - Example: you want to rewrite the SENDER address "user@ugly.domain" 
+## - to "user@pretty.domain", while still being able to send mail to the 
+## - RECIPIENT address "user@ugly.domain".
+## -
+## - Note: \$sender_canonical_maps is processed before \$canonical_maps.
+## -
+sender_canonical_maps = btree:/etc/postfix/sender_canonical
+
 
 ## - The maximal time a message is queued before it is sent back as 
 ## - undeliverable. Defaults to 5d (5 days)
@@ -949,6 +960,20 @@ else
    echo_failed
 fi
 
+echononl "   Create file \"sender_canonical\""
+if [[ ! -f /etc/postfix/sender_canonical ]]; then
+   cat <<EOF > /etc/postfix/sender_canonical
+@localhost  @$(hostname -f)
+EOF
+fi
+postmap btree:/etc/postfix/sender_canonical
+if [[ $? -eq 0 ]] ; then
+   echo_ok
+else
+   echo_failed
+fi
+
+
 ## - restart postfix
 ## -
 echononl "   Restart postfix"