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What does "550 internal oob The recipient is invalid" mean ? ...... Hard Bounce / Soft Bounce ?

Question asked by cf24257ec273b7e5e6e86de5b9584432bacdb27e on Jan 12, 2015
Latest reply on Mar 28, 2019 by Rohit Wali
We have had a return of nearly 2000 bounces from a recent email send that are appearing in our bounced email smartlist; so hard bounces. Looking at the reason codes, there are numerous, but one is 550 [internal] [oob] The recipient is invalid.

I am sure that some of these arent valid hard bounces but rather spam. One of our agents has been in regular email contact with a customer via outlook, but this same customer has come back via marketo as 550 [internal] [oob] The recipient is invalid.

Another one we have, under the same scenario as above, being emailed via outlook has returned via marketo with 550 5.1.1 User Unknown.

If anyone has any ideas or ways we can move forward, I would be really grateful as currently Marketo wont send to these people again but we know that some are indeed valid contacts.

Thanks :-)

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