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open resolver spamhaus

Tibor Odehnal

Hello,

some Users are unable to send E-mails to us.

They are getting

Remote Server returned '554 5.0.0 <utm.acme.at #5.0.0 smtp; 550 Error: open resolver; https://www.spamhaus.org/returnc/pub/66.185.117.243>'

if I klick on the Link  Spamhaus tells me that the Problem is on the receiving side.

I do'nt know where the IP is from.

I've read the Spamhaus Page but can't figure out what's wrong.

The Count of Emails getting blocked are rising every day and i have to solve the problem.

I've googled the problem but there are no evidences :-(

would be lucky if someone could help

TIA

Tibor



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Parents
  • 0

    The IP you see is from sending mail server.
    Your server don't accept the mails.
    The spamhaus link suggest a blacklist-entry ... But spamhaus say "it is n't".
    I don't understand the "open resolver" context. Is your UTM unable to resolve some addresses ... has it detected an "open resolver" for the sending server?  Which DNS-Server do you use at the UTM?
    I would try to change them temporary to 1.1.1.1 and 8.8.8.8 ...

Reply
  • 0

    The IP you see is from sending mail server.
    Your server don't accept the mails.
    The spamhaus link suggest a blacklist-entry ... But spamhaus say "it is n't".
    I don't understand the "open resolver" context. Is your UTM unable to resolve some addresses ... has it detected an "open resolver" for the sending server?  Which DNS-Server do you use at the UTM?
    I would try to change them temporary to 1.1.1.1 and 8.8.8.8 ...

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