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SMTP退回代码（电子邮件送达失败代码）

SMTP退回代码（电子邮件送达失败代码）的完整参考指南。了解所有退回代码、它们的含义以及如何处理它们。

SMTP Bounce Code 4.2.1: Mailbox Temporarily Disabled

/zh4-2-1-mailbox-temporarily-disabled

SMTP Bounce Code 4.2.2: Mailbox Full

/zh4-2-2-mailbox-full

SMTP Bounce Code 4.3.1: Mail System Full

/zh4-3-1-mail-system-full

SMTP Bounce Code 4.3.2: System Not Accepting Network Messages

/zh4-3-2-system-not-accepting

SMTP Bounce Code 4.4.1: No Answer From Host

/zh4-4-1-no-answer-from-host

SMTP Bounce Code 4.4.2: Connection Failure

/zh4-4-2-connection-failure

SMTP Bounce Code 4.4.3: Routing Server Failure

/zh4-4-3-routing-server-failure

SMTP Bounce Code 5.1.0: Other Address Status

/zh5-1-0-other-address-status

SMTP Bounce Code 5.1.1: User Unknown

/zh5-1-1-user-unknown

SMTP Bounce Code 5.1.2: Invalid Domain

/zh5-1-2-invalid-domain

SMTP Bounce Code 5.1.3: Bad Address Syntax

/zh5-1-3-bad-address-syntax

SMTP Bounce Code 5.2.0: Other Mailbox Status

/zh5-2-0-other-mailbox-status

SMTP Bounce Code 5.2.1: Mailbox Disabled

/zh5-2-1-mailbox-disabled

SMTP Bounce Code 5.2.2: Mailbox Full (Permanent)

/zh5-2-2-mailbox-full-permanent

SMTP Bounce Code 5.3.0: Mail System Error

/zh5-3-0-mail-system-error

SMTP Bounce Code 5.3.1: Mail System Full (Permanent)

/zh5-3-1-mail-system-full-permanent

SMTP Bounce Code 5.3.2: System Not Accepting (Permanent)

/zh5-3-2-system-not-accepting-permanent

SMTP Bounce Code 5.3.3: System Not Capable

/zh5-3-3-system-not-capable

SMTP Bounce Code 5.4.1: No Answer From Host (Permanent)

/zh5-4-1-no-answer-from-host-permanent

SMTP Bounce Code 5.4.2: Bad Connection (Permanent)

/zh5-4-2-bad-connection-permanent

SMTP Bounce Code 5.4.3: Routing Server Failure (Permanent)

/zh5-4-3-routing-server-failure-permanent

SMTP Bounce Code 5.4.4: Unable to Route

/zh5-4-4-unable-to-route

SMTP Bounce Code 5.5.0: Other Protocol Status

/zh5-5-0-other-protocol-status

SMTP Bounce Code 5.6.0: Other Media Error

/zh5-6-0-other-media-error

SMTP Bounce Code 5.7.0: Security Status (Other)

/zh5-7-0-security-status

SMTP Bounce Code 5.7.1: Delivery Not Authorized

/zh5-7-1-delivery-not-authorized