Fix transmission of mail for sympa

docker/postfix/etc/postfix/master.cf.append

@@ -7,7 +7,7 @@ sympa	unix	-	n	n	-	-	pipe
   flags=RF user=mailpipe:mailpipe argv=/usr/bin/ssh -i /etc/sympa/shared/id_rsa -o UserKnownHostsFile=/etc/sympa/shared/known_hosts -T sympa@sympa queue ${recipient}
 sympadomain	unix	-	n	n	-	-	pipe
   -o soft_bounce=yes
-  flags=RF user=mailpipe:mailpipe argv=/usr/bin/ssh -i /etc/sympa/shared/id_rsa -o UserKnownHostsFile=/etc/sympa/shared/known_hosts -T sympa@sympa queue sympa@${domain}
+  flags=RF user=mailpipe:mailpipe argv=/usr/bin/ssh -i /etc/sympa/shared/id_rsa -o UserKnownHostsFile=/etc/sympa/shared/known_hosts -T sympa@sympa queue ${recipient}
 sympabounce	unix	-	n	n	-	-	pipe
   -o soft_bounce=yes
   flags=RF user=mailpipe:mailpipe argv=/usr/bin/ssh -i /etc/sympa/shared/id_rsa -o UserKnownHostsFile=/etc/sympa/shared/known_hosts -T sympa@sympa bouncequeue ${user}@${domain}