Remote MX problem

I've got a pair of only www domains working on my server. Mail services are hosted remotely so I changed the corresponding MX record. Everything works okay with all domains except one, and this is what I get from bounced mails:

530 5.7.0 No AUTH command has been given.


I haven't found any easy solution to avoid this problem from my end. Does anybody have a clue?
Thanks in advance

 

 

 

 

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