-Delivery failed: SMTP error from remote mail server after RCPT TO:<b@x.y>: host 127.0.0.1 [127.0.0.1]: 550 NOTOK
-Delivery failed: SMTP error from remote mail server after MAIL FROM:<CALLER@myhost.test.ex>: host 127.0.0.1 [127.0.0.1]: 550 BAD MAIL
-Delivery failed: SMTP error from remote mail server after MAIL FROM:<CALLER@myhost.test.ex>: host 127.0.0.1 [127.0.0.1]: 450 TEMPORARY MAIL FAIL
+Delivery failed: H=127.0.0.1 [127.0.0.1]: SMTP error from remote mail server after RCPT TO:<b@x.y>: 550 NOTOK
+Delivery failed: H=127.0.0.1 [127.0.0.1]: SMTP error from remote mail server after MAIL FROM:<CALLER@myhost.test.ex>: 550 BAD MAIL
+Delivery failed: H=127.0.0.1 [127.0.0.1]: SMTP error from remote mail server after MAIL FROM:<CALLER@myhost.test.ex>: 450 TEMPORARY MAIL FAIL