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Lately I am getting a lot of mail delivery fails like 20% of the time.

It used to be less, then some domain on our shared hosting was blacklisted in spamhouse and all emails couldn't be delivered.

The problem was sorted and our IP isn't blacklisted any more, but the delivery rate is strangely low lately.

So I am asking if your IP is delisted from spamhouse can you still be affected by the previous listing?

Also what can be learned from a mail delivery fail?

This is the error I'm getting:

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
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Quite frequently more than single black listing is triggered by "disputable email sending". Are you sure your IP is not blacklisted elsewhere? –  Andrzej A. Filip May 21 '13 at 17:42
    
Not that im aware of. Where can I check? –  user1721135 May 21 '13 at 18:48
    
Also what is disputable email sending? Like someone using the IP for spamming? The original listing was because of a hacked site on this IP. –  user1721135 May 21 '13 at 18:49
    
1) DNSBL listing check: Choose one of a few services listed at the first page of encrypted.google.com/search?q=dnsbl+check ; Some listings are not worth any serious consideration (e.g. APEWS) 2) "hacked (web?) site on this IP" most likely get not only spamhause attention. –  Andrzej A. Filip May 21 '13 at 20:11
    
I checked but its not listed there. The hacked site was removed, and the spamhouse listing disappeared. strange. Maybe its the recepients servers? Although that would be strange. –  user1721135 May 21 '13 at 21:10
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