DNS. What IPs can send email with my domain name

For verify how can send email with our domain, you can connect to https://www.digwebinterface.com/.

Put your domain name, and select Type: "ANY"

Result is at line:

ip4: X.X.X.X

You can view others IP list that are authorized to can send email and they don't have problems if some do a reverse source check.

MX register:

The result show your MX register. You could had more than one IP linked this name: 

Now,  Check the MX register

We can view than our MX register had two IP.

In summary there are 3 IPs that can send email with our domain name (2 MX + 1 SPF) without problems.

It's possible that we have configurated that un email from my domain can't arrive from out of my network, We can not receive our email from outside our network, using this command in our Exchange Server:

Get-ReceiveConnector | remove-ADPermission -User "NT AUTHORITY\ANONYMOUS LOGON" -ExtendedRights ms-Exch-SMTP-Accept-Authoritative-Domain-Sender

Check at Windows 2012 R2 
by GoN | Published: July 7 2017 | Last Updated: