Browse bounce messages for permanent below

5.0.0

Unknown issue

Undefined Issue

5.1.0

Unknown issue with email address

Recipient Address Problem

5.1.1

User name of email address not valid

Recipient Address Problem

5.1.2

Domain name of email address not valid

Recipient Address Problem

5.1.3

Email address malformed

Recipient Address Problem

5.1.4

Multiple mailboxes for recipient

Recipient Address Problem

5.1.5

Valid email address

Bad Sending Address

5.1.6

Email address no longer accepts or forwards messages

Bad Sending Address

5.1.7

Sender's address is written incorrectly

Bad Recipient System

5.1.8

Sending address is bad or can't accept replies

Recipient Mailbox Issue

5.1.9

Message routed to non-email system

Recipient Mailbox Disabled

5.2.0

Unknown issue with mailbox

Recipient Mailbox Full

5.2.1

Mailbox is not accepting new messages

Message Too Long

5.2.2

Mailbox is full

Mailing List Problem

5.2.3

Message is too long

Recipient System Problem

5.2.4

Mailbox has a mailing list system issue

Recipient System Problem

5.3.0

Unknown issue with the receiving system

Recipient System Problem

5.3.1

Email system is full

Recipient System Problem

5.3.2

Receiving email system not operable

Recipient System Problem

5.3.3

Message features not supported

Recipient System Problem

5.3.4

Message is too large

Recipient System Problem

5.3.5

Incorrect configuration of system

Network Connection Problem

5.3.6

Message priority issue

Network Connection Problem

5.4.0

Unknown issue with network connection

Network Connection Problem

5.4.1

Network is busy

Network Connection Problem

5.4.2

Network connection timed out

Network Connection Problem

5.4.3

Network issue with the receiving system

Network Connection Problem

5.4.4

Email routing issue due to network

Network Connection Problem

5.4.5

Overloaded network

Delivery Time Expires

5.4.6

Network issue caused a mail loop

Mail Transmission Problem

5.4.7

Message expired before delivery completed

Mail Transmission Problem

5.5.0

Unknown issue with your email server

Mail Transmission Problem

5.5.1

Bad messaging command in transmission

Mail Transmission Problem

5.5.2

Email system sent bad command

Mail Transmission Problem

5.5.3

Too many recipients for message

Mail Transmission Problem

5.5.4

Email system sent bad command

Mail Transmission Problem

5.5.5

Email systems were incompatible

Message Content Issue

5.5.6

Messaging command in transmission too long

Message Content Issue

5.6.0

Unknown issue with the message content

Message Content Issue

5.6.1

Message content or attachment not supported

Message Content Issue

5.6.10

Email servers are not responding appropriately

Security or Policy Issue

5.6.2

Message content not accepted by recipient server

Message Content Issue

5.6.3

Message content could not be processed for delivery

Message Content Issue

5.6.4

Content loss during delivery

Message Content Issue

5.6.5

Message content not accessible to recipient server

Message Content Issue

5.6.6

Email content could not be accessed

Message Content Issue

5.6.7

Email address format not supported

Message Content Issue

5.6.8

Email servers are not responding appropriately

Message Content Issue

5.6.9

Email servers are not communicating with each other

Security or Policy Issue

5.7.0

Unknown security or policy concern

Security or Policy Issue

5.7.1

Message sender blocked by receiving server

Security or Policy Issue

5.7.10

Stronger security or encryption needed

Authentication Required

5.7.11

Encryption needed for network connection

Sender Account Issue

5.7.12

Authentication required

Security or Policy Issue

5.7.13

Sender account disabled

Message Priority Issue

5.7.14

Potential security issue for sender

Message Priority Issue

5.7.15

Message priority level too low

5.7.16

Message too large for given priority level

5.7.2

Not authorized to send to mailing list

Security or Policy Issue

5.7.3

Security features could not be interpreted

Security or Policy Issue

5.7.4

User authentication for message failed

Security or Policy Issue

5.7.5

Message authentication issues

Security or Policy Issue

5.7.6

Message encryption issues

Security or Policy Issue

5.7.7

Potentially corrupt message

Security or Policy Issue

5.7.8

User authentication failed

Email Encryption Issue

5.7.9

Security issue with user authentication

Email Encryption Issue