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Thread: Possible SMTP DoS attack?

  1. #11
    sparky is offline Active Member
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    Hmm..... I guess no one has any answers for me for why my server's being so weird??

    It's actually ok now in the fact that I am not getting the resources filled with people trying to connect through it, but I still can't send any mail through port 25 :-(

    Secure port is fine though

  2. #12
    uxbod's Avatar
    uxbod is offline Moderator
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    Can you telnet on port 25 to a remote MTA ?

  3. #13
    sparky is offline Active Member
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    Yep no probs.....

    My concern though is with MUA's! Thunderbird won't connect to my server??

    Currently I am connecting through port 465, before I used to be able to connect on port 25 via Seamonkey to send email......

  4. #14
    uxbod's Avatar
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    I presume from the workstation where the MUA is installed you can telnet to port 25 on your ZCS server ? when your MUA does attempt a connection anything showing in your ZCS logfiles ?

  5. #15
    veronica is offline Outstanding Member
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    Do you use any RBL service ? It is always beneficial as 70% of spam traffic is removed at initial client connection stage. This will help to keep your worker threads free for legitimate traffic

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