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Access denied - Invalid HELO name

Discussion in 'E-mail Discussions' started by keat63, Dec 12, 2014.

  1. keat63

    keat63 Well-Known Member

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    Any ideas what this is trying to do ?

    Code:
    2014-12-12 12:37:43 H=114-24-5-187.dynamic.hinet.net (xxx.my.server.xxx) [114.24.5.187]:1829 rejected MAIL <someone@yahoo.com.tw>: Access denied - Invalid HELO name (See RFC2821 4.1.3)
     
    #1 keat63, Dec 12, 2014
    Last edited by a moderator: Dec 12, 2014
  2. rscalover

    rscalover Member

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    Re: Any ideas what this is trying to do ?

    That looks like somebody is trying to use your mailserver to send mail but your server is denying the attempt.I get those attempts to from hostnames ending in "hinet.net" it's an abussive isp.
     
  3. keat63

    keat63 Well-Known Member

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    He's persistent
     
  4. keat63

    keat63 Well-Known Member

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    Re: Any ideas what this is trying to do ?

    My server has it's own hostname, which i've no intentions of emailing from.
    I will only ever email from packages /accounts.
    If i removed the mx entries from DNS for the hostname, would this stop them and would it have any other implications ?
     
  5. cPanelMichael

    cPanelMichael Forums Analyst
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  6. keat63

    keat63 Well-Known Member

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    Code:
    2014-12-12 12:37:40 SMTP connection from [114.24.5.187]:4744 (TCP/IP connection count = 1)
    
    2014-12-12 12:37:41 H=114-24-5-187.dynamic.hinet.net (xxx.xxx.xxx.31) [114.24.5.187]:4744 rejected MAIL <z2007tw@yahoo.com.tw>: Access denied - Invalid HELO name (See RFC2821 4.1.3)
    
    2014-12-12 12:37:41 SMTP connection from 114-24-5-187.dynamic.hinet.net (xxx.xxx.xxx.31) [114.24.5.187]:4744 closed by DROP in ACL
    
    2014-12-12 12:37:42 SMTP connection from [114.24.5.187]:1829 (TCP/IP connection count = 1)
    
    2014-12-12 12:37:43 H=114-24-5-187.dynamic.hinet.net (xxx.xxx.xxx.153) [114.24.5.187]:1829 rejected MAIL <z2007tw@yahoo.com.tw>: Access denied - Invalid HELO name (See RFC2821 4.1.3)
    
    2014-12-12 12:37:43 SMTP connection from 114-24-5-187.dynamic.hinet.net (xxx.xxx.xxx.153) [114.24.5.187]:1829 closed by DROP in ACL
    Looks like he's had a go at both IP's
     
    #6 keat63, Dec 12, 2014
    Last edited by a moderator: Dec 12, 2014
  7. cPanelMichael

    cPanelMichael Forums Analyst
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    You could block the IP address in your firewall if you want to prevent that IP address from making additional SMTP connection attempts. Otherwise, the HELO check is working successfully.

    Thank you.
     
  8. keat63

    keat63 Well-Known Member

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    CSF has blocked him, but no doubt he might come back under another IP.
    so I may consider blocking the first two octets i guess

    As always, thanks for your help guys. Much appreciated.
     
  9. Infopro

    Infopro cPanel Sr. Product Evangelist
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    Twitter:
    Be careful how you block IPs. For example that crazy list in your other thread (removed now, bad advice).

    Let CSF do its job, automagically. Spending time understanding all the settings in CSF and how to make best use of them, far more important than blocking already blocked IPs. ;)
     
  10. keat63

    keat63 Well-Known Member

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    Hi Info.

    That crazy list :), i added to CPHULK.
    I take it, this isn't good ?
    Could you elaborate please.


    As regards blocking ISP's, i've no interest in traffic from TW, as we are a UK company and would only supply to customers in the UK.
    We have no marked with TW.
    I have learnt that blocking whole continents has detrimental effect.

    Thanks
     
    #10 keat63, Dec 13, 2014
    Last edited: Dec 13, 2014
  11. cPanelMichael

    cPanelMichael Forums Analyst
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    It's not a good idea to block IP addresses in such a broad scope because you can block legitimate traffic.

    Thank you.
     
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