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I am back again with problem, which i didn't have for a long time. We are running email marketing campaigns locally for our clients and we do send a lot of emails, but in a few years time we didn't have this like bounce from Microsoft: I've tried to find solution but still no luck. Any...

Hello again, We have a client which complains that email messages sent from our server (we are an esp) gets delivered to them with modified subject in which word [spam] is added as prefix. What could be a problem? We have checked our ip records on all major blacklists and everything seems...