08:28 08:42 SMTP-(0000014B) >MAIL FROM:<[EMAIL PROTECTED]>
08:28 08:42 SMTP-(0000014B) 451 <[EMAIL PROTECTED]>... Sender domain must resolve
08:28 08:42 SMTP-(0000014B) SMTP_DELIV_FAILED
08:28 08:42 SMTP-(0000014B) >QUIT
08:28 08:42 SMTP-(0000014B) 221 linterlock.thehartford.com closing connection

"sender" is the "mail from: sender@senderdomain".

# dig memdt.org

; <<>> DiG 8.2 <<>> memdt.org
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 4
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUERY SECTION:
;;      memdt.org, type = A, class = IN

;; AUTHORITY SECTION:
ORG.                    1D IN SOA       A.ROOT-SERVERS.NET. hostmaster.nsiregistry.NET. (
                                        2000082701      ; serial
                                        30M             ; refresh
                                        15M             ; retry
                                        1W              ; expiry
                                        1D )            ; minimum

There is no domain "memdt.org"

Len


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