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Im getting unexpected results from Bounce.io. It was working properly for months but now it seems that it isn't.
The bounces just say this now. I don't know where this message is being derived. Anyone else using this service and have some info?
Message Not Delivered
There was an issue delivering your message to email@example.com. This is an 5.1.1 Error.
This error typically means: User name of email address not valid
Find out more information about this 5.1.1 bounce message.
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