Possible values for errors

error_related_to	Error	What really happened
recipient	user unknown	Email address doesn't exist, double check it for typos !
mailbox inactive	Account has been inactive for too long (likely that it doesn't exist anymore).
quota exceeded	Even though this is a non-permanent error, most of the time when accounts are over-quota, it means they are inactive.
blacklisted	You tried to send to a blacklisted recipient for this account.
spam reporter	You tried to send to a recipient that has reported a previous message from this account as spam.
domain	invalid domain	There's a typo in the domain name part of the address. Or the address is so old that its domain has expired !
no mail host	Nobody answers when we knock at the door.
relay/access denied	The destination mail server is refusing to talk to us.
greylisted	This is a temporary error due to possible unrecognized senders. Delivery will be re-attempted.
typofix	The domain part of your recipient email address was not valid.
content	bad or empty template	You should check that the template you are using has a content or is not corrupted.
error in template language	Your content contains a template language error, you can refer to the error reporting functionalities to get more information.
spam	sender blocked	This is quite bad! You should contact us to investigate this issue.
content blocked	Something in your email has triggered an anti-spam filter and your email was rejected. Please contact us so we can review the email content and report any false positives.
policy issue	We do our best to avoid these errors with outbound throttling and following best practices. Although we do receive alerts when this happens, make sure to contact us for further information and a workaround
system	system issue	Something went wrong on our server-side. A temporary error. Please contact us if you receive an event of this type.
protocol issue	Something went wrong with our servers. This should not happen, and never be permanent !
connection issue	Something went wrong with our servers. This should not happen, and never be permanent !
mailjet	preblocked	You tried to send an email to an address that recently (or repeatedly) bounced. We didn't try to send it to avoid damaging your reputation.
duplicate in campaign	You used X-Mailjet-DeduplicateCampaign and sent more than one email to a single recipient. Only the first email was sent; the others were blocked.

Possible values for errors

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