Recipient Verification

[asifsujon]

• Observed that using my domain address like xxx@xxx.com having the bad IP, multiple emails has been send to bulgaria, japan etc. How to resolve that issue.

[xshkurti]

@asifsujon 
Can you please clarify a little bit the situation? it is very general query with no details what happens. what do you mean by bad IPs, what do you mean by using my domain address? where do you use your domain address? what emails are sent to different countries? where do these emails originate from?

[asifsujon]

@xshkurti 

assume that my domain is asif@test.com.

Now any user from external world, using a user like x@test.com (which is not a valid user of my domain test.com) using my smtp ip and port and give email to some others external domain like x@testing.com, that time I observed that mail has been successfully sent.

Now, as x is not a valid user of my domain and the IP using by the user also not my IP, how to stop those types of activity.

However, now implement an access control policy for that, like if anyone wants to give email, his IP will be checked first, if his IP is not my Domain IP, then the mail will be rejected.

Regards

Islam

[AEK]

Is it sent from your public IP?

[asifsujon]

No, Spammers using their own IP address. They just use a nonsexist domain id like x@test.com of my domain test.com and also use my SMTP IP and Port. 

Regards

Islam

[AEK · Accepted solution]

Hi Islam

You cannot stop spammers activity.

Instead, check your SPF, it should contain "-all" at the end in order to instruct other mail servers/gateway to reject any mail from non-legitimate IP addresses.

Then the other mail servers/gateways (if well configured) will reject any email sent on behalf of your domain from a non-legitimate IP address.

[ElvaHudson]

Thank you, I will do it as you said.

[asifsujon]

Thank you very much, I have already implemented access control policy for that after seeing the incident. Now it's working absolutely fine.