电子邮件营销常见退信代码解析

我们在做EDM的时候,电子邮件发送成功率是重要指标之一。除了软弹回和硬弹回统计,发送系统往往会提供给我们更详细的退信原因,如下所示email退信代码。仔细查看退信原因并找到解决方法可以大大提高邮件营销成功率及营销效果。并且能保证整个邮件发送通道的健康和持续。

分类退信代码
认证失败535 Authentication failure
收件地址数量超限556 The number of RCPTs is over size
邮件大小超限557 The length of DATA content is achieved the maximum threshold
命中无效地址库559 Invalid rcptto
收信域名 MX 解析查询失败423 Dns resolve error
524 Host not found by dns resolve
526 No data by dns resolve
连接失败427 Socks Connect to UNREACHABLE host
发信额度超限制552 Monthly sending quota exceeded
552 Daily sending quota exceeded
552 Not enough sending quota
反垃圾类错误554 Reject by content spam
发信账户状态异常551 Main account unavailable
接收地址不存在521 Recipient address rejected
550 5.1.1 
550 Invalid User
550 Mailbox not found
550 user not exist
550 User not found
554 delivery error: dd Sorry your message to $EMAIL cannot be delivered. This account has been disabled or discontinued
554 delivery error: dd This user doesn’t have a $DOMAIN account ($EMAIL)
退信代码包含如下信息:
account does not exist
invalid address
invalid mailbox
invalid recipient
invalid user
is not a valid mailbox
is not a valid user
mailbox not found
no mailbox by that name
no mailbox here by that name
no such address
no such mailbox
no such recipient
no such user
recipient does not exist
recipient is not exist
recipient not found
recipient unknown
unknown or illegal alias
unknown user
user not exist
user not found
user unknown
账号黑名单550 Mail is rejected by recipients
550 sender in prision
550 User in blacklist
IP 黑名单450 DT:RBL
554 HL:IPB
550 DY-001
550 DY-002
550 OU-001
550 OU-002
550 SC-003
550 SC-004
550 in an RBL
550 ip in prision
550 Your IP address is blacklisted
550 5.7.1 Service unavailable; client [$IP] blocked using $DOMAIN
553 5.7.1 [BLxx] Connections will not be accepted from $IP
554 5.7.1 Client host [$IP] blocked using $DOMAIN
550 5.7.1 Mail from IP $IP was rejected due to listing in Spamhaus SBL
550 IP $IP is blocked
554 IP in blacklist
598 ip address in blacklist
退信代码包含如下信息:
denied by RBL
in a DNS blacklist
in the RBL
is filtered by RBL
is listed in RBL
接收地址被限制450 4.2.1 
550 Mailbox unavailable or access denied
IP 频率超限421 HL:ICC
421 HL:IFC
421 RP-001
421 RP-002
421 RP-003
550 Connection frequency limited
550 IP frequency limited
发信账号频率超限451 MI:SFQ
550 MI:STC
550 RP:TRC
554 MI:STC
550 Sender frequency limited
发信域名频率超限550 Domain frequency limited
垃圾邮件421 4.7.0 [xx] Message from ($IP) temporarily deferred
421 4.7.0 [xx] Message temporarily deferred
450 Requested action not taken
451 DT:SPM
550 DT:SPM
550 SC-001
521 5.2.1 : AOL will not accept delivery of this message
550 5.7.1 Message rejected as spam by Content Filtering
550 Mail content denied
550 Suspected spam
554 Message not allowed
退信代码包含如下信息:
as spam
is spam
spam denied
spam detected
spam filtering
suspected spam
contain the spam contents
邮件大小超限550 Message too large
邮箱空间满452 4.2.2
552 5.2.2
550 mailbox limit exceeded
552 mailbox is full
552 5.2.1 Quota exceeded or service disabled
退信代码包含如下信息:
is over quota
exceed mailbox quota
接收方临时故障400 the mta server of unexpected closed
450 Service temporarily unavailable
451 $DOMAIN Resources temporarily unavailable
451 4.7.1 Sorry, the service is currently unavailable
451 Internal resource temporarily unavailable
451 Resources temporarily not available
451 Temporarily unable to process your email
账号灰名单450 4.2.0 <$EMAIL>: Recipient address rejected
451 4.7.1 Greylisting in action
451 Grey bounce
退信代码包含如下信息:
grey listed
接收地址格式错误501 Bad address syntax
550 MI:IMF
SPF 验证失败520 ip and spf record not match
550 MI:SPF
550 SPF check failed
网络异常400 the mta server of unexpected closed
连接失败或者MX 解析查询失败427 Socks Connect to
423 Dns resolve error
流控has been temporarily rate limited
无效地址554 delivery error: dd
收信系统灰名单机制含有 GreyListed
try again later
come back later
Internal resource temporarily unavailable

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