Domain of sender address does not resolve
Hello, I have problem to send email to domain hosted by your server xxxx.xxxx.iphmx.com
When I send email to @gtt.net or @eni.com the email remain in queue with this erro:
85277628B50 1257 Thu Feb 27 14:36:19 [email protected] | [email protected] | (host mx1.hc3324-5.iphmx.com[184.108.40.206] said: 451 #4.1.8 Domain of sender address does not resolve (in reply to MAIL FROM command))
Seem our DNS do not recognise the sender domain @webdesk.it or our sender server smtps.wki.it
Can you explain why these messages are blocked?
Dario Lesca for WKI.IT