Bounced emails - email messages that cannot be delivered to a recipient’s email address due to some reasons not depending on our system.
Possible reasons for bounced emails:
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Message in logs
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Comments
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Amazon SES has suppressed sending to this address because it has a recent history of bouncing as an invalid address
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AWS doesn't send emails to this address because it has a history of bounced emails
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smtp; 511 sorry, no mailbox here by that name (#5.1.1 - chkuser)
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Invalid address
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smtp; 550 4.4.7 Message expired: unable to deliver in 840 minutes
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Invalid address
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smtp; 550 5.1.1
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Everything that starts with "smtp; 550 5.1.1" means wrong address
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smtp; 550 5.4.1 Recipient address rejected: Access denied.
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Recipient does not accept emails from our domain. So the issue is on their side
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smtp; 550 5.4.4 Invalid domain
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Invalid address. Particularly domain part of it
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smtp; 550 5.5.0 Requested action not taken: mailbox unavailable
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Invalid address
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smtp; 550 5.7.1 Service refuse. Veuillez essayer plus tard. service refused, please try later.
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Issues with recipient's email provider
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smtp; 550 Address unknown
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Invalid address
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smtp; 550 Invalid Recipient
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Invalid address
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smtp; 550 RCPT TO:<some_email_address> User unknown
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Invalid address
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smtp; 550 Requested action not taken: mailbox unavailable
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Invalid address
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smtp; 550 spam detected
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The email was marked as spam by recipient's mail provider
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smtp; 550-5.2.1 The email account that you tried to reach is disabled
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Address is disabled
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smtp; 552 1 Requested mail action aborted, mailbox not found
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Invalid address
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smtp; 552 5.2.2 Over quota
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Recipient's mailbox is full
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smtp; 553 5.1.2 Unknown mail server. Could not find a mail server for [some domain]
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Invalid address. Particularly domain part of it
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smtp; 554 30 Sorry, your message to [some_email_address] cannot be delivered. This mailbox is disabled
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Address is disabled
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smtp; 554 5.7.1
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Everything that starts with "smtp; 554 5.7.1" means that the email was blocked as spam
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smtp; 558 5.7.1
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Everything that starts with "smtp; 558 5.7.1" means that the email was blocked as spam
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smtp;550 5.1.10 RESOLVER.ADR.RecipientNotFound
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Invalid address
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smtp;550 5.5.0 Requested action not taken: mailbox unavailable.
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Invalid address
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smtp;550 5.7.193 UnifiedGroupAgent; Delivery failed because the sender isn't a group member or external senders aren't permitted to send to this group.
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Recipient does not accept emails from outside of their system
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smtp;554 5.2.2 mailbox full; STOREDRV.Deliver.Exception:QuotaExceeded
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Recipient's mailbox is full
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smtp;554 5.4.14 Hop count exceeded - possible mail loop
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Looks like some kind of error on recipient's side
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