Can not verify user; accepting message for attempt
The message was received properly, and there is some positive record of the email address existing. However, it's most likely not on the delivered mail server and being held until verification is possible. 95% of the time, this message will be delivered as expected.
The email message should be delivered with out an issue, however it would be wise to monitor the email log for any other indications that it failed. If a failure occurs, it's best to ensure the email address is correct.