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Reverse DNS check

Last post 04-03-2019, 17:08 by PaulW. 1 replies.
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  •  03-31-2019, 13:10

    • Anaglypta is not online. Last active: 03 Apr 2019, 16:25 Anaglypta
    • Top 500 Contributor
    • Joined on 09-30-2016
    • Luton, England
    • Member
    • Points 340

    Reverse DNS check

    Morning all,

    Is there any way to perform a RDNS check in MercuryS.

    What I want to do is check the HELO/EHLO text against RDNS and if they don't match, reject the connection since most email servers provide a FQDN as the HELO/EHLO command.

    i.e This IP has no RDNS info:-

    Connection from 202.134.4.162
    T 20190331 103329 5c59bad3 EHLO dua.iix.mx
    T 20190331 103329 5c59bad3 STARTTLS
    T 20190331 103330 5c59bad3 EHLO dua.iix.mx
    T 20190331 103331 5c59bad3 MAIL FROM:<bkk@ambon.go.id> SIZE=247690

    Checking RIPEstat the IP resolves to an address in jakata with no RDNS

    https://stat.ripe.net/202.134.4.162#tabId=at-a-glance

    I've looked at the SmtpEvt module, but didn't find anything that might help. It might be a good addition though.

    GreyWall works well to remove a lot of instances, but a few still get through.

    Thanks in advance

    John.

     

  •  04-03-2019, 17:08

    • PaulW is not online. Last active: 04 Apr 2019, 10:01 PaulW
    • Top 10 Contributor
    • Joined on 05-08-2007
    • UK
    • SuperStar
    • Points 18,275

    Re: Reverse DNS check

    That would be a good option to check.

    Another would be to see if the FQDN in a HELO resolves.

     

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