220 myhost.test.ex ESMTP Exim x.yz Tue, 2 Mar 1999 09:44:33 +0000 550-Callback setup failed while verifying <userx@broken.example> 550-Called: 127.0.0.1 550-Sent: MAIL FROM:<> 550-Response: 550 I'm misconfigured 550-The initial connection, or a HELO or MAIL FROM:<> command was 550-rejected. Refusing MAIL FROM:<> does not help fight spam, disregards 550-RFC requirements, and stops you from receiving standard bounce 550-messages. This host does not accept mail from domains whose servers 550-refuse bounces. 550 Sender verify failed 221 myhost.test.ex closing connection 220 myhost.test.ex ESMTP Exim x.yz Tue, 2 Mar 1999 09:44:33 +0000 250 OK 250 Accepted 221 myhost.test.ex closing connection 220 myhost.test.ex ESMTP Exim x.yz Tue, 2 Mar 1999 09:44:33 +0000 550-Callback setup failed while verifying <userx@broken.example> 550-(result of an earlier callout reused). 550-The initial connection, or a HELO or MAIL FROM:<> command was 550-rejected. Refusing MAIL FROM:<> does not help fight spam, disregards 550-RFC requirements, and stops you from receiving standard bounce 550-messages. This host does not accept mail from domains whose servers 550-refuse bounces. 550 Sender verify failed 221 myhost.test.ex closing connection ******** SERVER ******** Listening on port 1224 ... Connection request from [127.0.0.1] 220 Welcome EHLO myhost.test.ex 250 Hi MAIL FROM:<> 550 I'm misconfigured QUIT 221 Bye End of script Listening on port 1224 ... Connection request from [127.0.0.1] 220 Welcome EHLO myhost.test.ex 250 Hi MAIL FROM:<userx@ok.example> 250 OK RCPT TO:<usery@broken.example> 250 OK QUIT 221 Bye End of script