SOLUTION FOR : 554 5.7.1 This message has been blocked because the HELO/EHLO domain is invalid

SOLUTION FOR : 554 5.7.1 This message has been blocked because the
HELO/EHLO domain is invalid

When this happens in case it is an exchange email server to exchange
email server communication it means:

that the FQDN is not correctly set in you exchange server (recipient).

for that you go in the exchange server (mmc) management console look

- Protocoles
- default virtual SMTP server

Right mouse click on Properties of SMTP virtual server

Then on the "Delivery" (Remise in French) tab (last one to the right)

Then click on "Advanced Options/ Settings"

you should see there the field where the FQDN is set for your exchange

it has to match you DNS MX Record !

if your DNS MX Record says

You can use "NSLOOKUP" with set type=all to check your DNS MX record.

set type=all
blabla blabla and where you see: MX preference = 10, mail exchanger =

Then you field Fully Qualified Name should READ:


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