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.

asifsujon

Explorer

Solved

Recipient Verification

Forum|Forum|2 years ago
May 2, 2024
7 replies
2221 views

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.

FortiMail

Best answer by AEK

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.

xshkurti

Staff

@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?

asifsujonAuthor

Explorer

@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

SuperUser

Is it sent from your public IP?

AEK

asifsujonAuthor

Explorer

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

AEKAnswer

SuperUser

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.

AEK

ElvaHudson

Visitor III

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asifsujonAuthor

Explorer

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

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