Just today I noticed wom very worrying behaviour on my corporate mail server: As I logged on via Outlook Express I received a slew of bounced ‘undeliverable’ emails. So the mail server responded back with a 554 Invalid recipient error. In our example bounce-back error above the reason the message has failed is because an auto-reply was trying to be sent to an account that didn’t exist. To better understand soft and hard bounces, and general email bounceback errors you can read why does email bounce, bounceback, or error?
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554 Transaction Failed Spam Message not queued.554 Virus found, message permanently rejected (#5.3.0)īecause errors in the 554 series don’t always bounceback for a common reason, they could be either a hard or soft bounce. 554 Spam violation, the content of your e-mail contains illegal characters, re-sent after examination. 554 Sorry, no mailbox here by that name. 554 Message not allowed – Email not accepted for policy reasons. 554 Message is not RFC compliant missing “Date” header. 
554 delivery error: dd This user doesn’t have a account. 
554 5.7.9 Message not accepted for policy reasons. 
554 5.7.1 Message blocked due to spam content in the message. 554 5.7.1 Message blocked due to spam content in the message. Received: from Admin by with local (Exim 4.77)įor Sat, 04:40:28 -0700ĭate: Sat, 04:40:28 -0700 Common variations of the 554 email error
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