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I have one of my users that have an account on the domain and sending mailwithout problems. Except for one recipient. The errors I get is this one

''recipient email''( 550-Verification failed for <''sender's email''>
550-Previous (cached) callout verification failure
550-Sender verification failed (Sending test bounce to ''sender's email''
550 failed).)

Can somebody help me please?


Jean-Pierre Moreau

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Request the destination domain to turn off 'callout verification'. It's rubbish and leads to lots of problems. (This is further discussed in another topic, search for it and you'll find more info).
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