ESA AsyncOS 7.6.2 - 014 | Address filter and invalid domain name

Hello

Need your help please.

I'm having problems with my email filter device that receives e-mail invalid domain and because of my Lake of knowledge on the product it self, I need advice how I can stop this problem.

the test I do is:

############################################################

Telnet mx1.mymailserver.com

220*****************************

HELO malange.com

MAIL FROM: [email protected] / * /

250 sender [email protected] / * /> ok

RCPT TO: [email protected] / * /

250 container [email protected] / * /> ok

DATA

353 go

aaassddfdsnfdnf

.

250 ok: 4206071 Message accepted

QUIT SMOKING

221

##########################################################

I want to stop this kind of message to reach the Inbox mailbox in our Organization. need advice.

Best regards

Alcides Miguel

Hello Alcides,

Areas with no valid sending emails through, there's a feature called "sender envelope DNS audit" where it will make a DNS reverse lookup on the part of the domain of the e-mail-and if there is no valid DNS record found, he rejects the attempt to mail - in. If this feature meets your needs, you can activate it in your GUI > political Mail > overview HAT > click the policy of flow of mail (ACCEPTED, etc.) that you want to enable it for. Scroll to the bottom and you will see the DNS of the envelope sender verification and activate it.

output would look like:

EHLO test
220 ironport.lab.com ESMTP
250 ironport.lab.com
250 8BITMIME
SIZE 250 20971520
mail from:[email protected] / * />
553 #5.1.8 domain of sender address [email protected] / * /> does not exist
^]

Otherwise if you want to delete the emails from a specific domain, you can run content filters to drop to the envelope sender if you do not want to accept e-mails from him.

Kind regards

Matthew

Tags: Cisco Security

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