5.7.1 Bounce Back - MDaemon Server

Hi all

We are currently getting a lot of complaints of bounceback emails from our server. It is not for all email addresses, only some but for the ones who it occurs all the time.

The message we receive is:

[] #<[] #5.0.0 smtp; 5.3.0 - Other mail system problem 550-'5.7.1 Sorry, message looks like spam or phish to me (OP)'

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We have disabled both the Spam Filter and AV temporarily and it still occurs.

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What are your counter measures are, do you use DNS black lists?

What is your mail server?

The error is a non-standard so it is hard to say what the cause is.

Is the IP reflected yours?

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