163经销代理服务商：深圳市阔步实业有限公司

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• 退信提示：553 you don't authenticate or the domain is not allowed relay
• 退信提示：550 SC-001 (COL004-MC6F26) Unfortunately, messages from xx weren't sent
• 退信提示：421 Read data from client error
• 退信提示：554 5.7.1 You are not allowed to connect by Symantec Security Center
• 退信提示：554 sender is rejected
• 退信提示：550 5.7.1 Unable to deliver to
• 退信提示：550 permanent failure for one or more recipients
• 退信提示：554 5.7.1 The message matches a profile the Internet community may consider spam
• 退信提示：554 5.7.1 : Recipient address rejected: Access denied
• 退信提示：550 Not verified by SPF
• 退信提示：553 mail.xxxxxx.com does not accept mail from
• 退信提示：550 xxx@xxx.com.cn:domain locked
• 退信提示：Unable to find the recipients email server. The DNS query has failed
• 退信提示：552-5.7.0 This message was blocked because its content presents a potential security issue
• 退信提示：550 Mail content denied
• 退信提示：554 delivery error: dd This user doesn't have a e-mailaccount
• 退信提示：550 5.7.1 Mailbox unavailable. No reverse name (PTR) for your sender IP
• 退信提示：550 Remote host is in blacklist
• 退信提示：452-4.2.2 The email account that you tried to reach is over quota
• 退信提示：550 Mail rejected
• 退信提示：553 sorry, your domain mismatches client IP. Server rejected.
• 退信提示：550 the account is disable
• 退信提示：550 No RDNS entry for
• 退信提示：550 5.7.1 Service unavailable, Client host blocked using Spamhaus
• 退信提示：550 RC:NE xx@xxxx.com The email account does not exist
• 退信提示：554 refused, spam message