Outlook read receipt = relaying?
A number of times recently people have sent me email with a read receipt, which I've agreed to send back to the originator. However, the read receipt is rejected by NTL's email server giving a '550 relaying mail to <domain> is not allowed' - image attached.
I've tried sending myself an email with a read receipt request, and its processed and sent back without error, so this only appears to be a problem with requests external to NTL.
Has anyone come across this problem and worked out how to fix it?
TIA.
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