220 myhost.test.ex ESMTP Exim x.yz Tue, 2 Mar 1999 09:44:33 +0000
250-myhost.test.ex Hello CALLER at a.b.c.d
250-SIZE 52428800
250-8BITMIME
250-PIPELINING
250 HELP
250 OK
250 Accepted
354 Enter message, ending with "." on a line by itself
550-Verification failed for <CALLER@test.ex>
550-custom message
550 message="Sender verify failed"
221 myhost.test.ex closing connection