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• 退信提示：421 4.3.2 Service not available
• 退信提示：Recipient address rejected: Access denied
• 退信提示：553 Blocked Using Spam Pattern, Your Message May Contain The Spam Contents
• 退信提示：No mail servers appear to exists for the recipient's address
• 网易个人邮箱和企业邮箱常见退信说明
• 退信提示：550 Ip frequency limited
• 退信提示：501 Bad address syntax
• 退信提示：451 Temporary internal failure, please contact your email administrator
• 退信提示：550 5.7.606 Access denied, banned sending IP
• 退信提示：552-5.2.3 Your message exceeded Google's message size limits
• 退信提示：450 Client host rejected: cannot find your hostname
• 退信提示：553 can't verify FROM domain in DNS；domain does not exist
• 退信提示：550 Sender frequency limited
• 退信提示：501 This server will not accept forged credentials
• 退信提示：500 5.0.0 Service unavailable
• 退信提示：552 Message size exceeds maximum permitted;552 5.3.4 Error: message file too big
• 退信提示：550 5.7.606 Access denied, banned sending IP
• 退信提示：550 Deliver to local org only
• 退信提示：550 Unknown local part
• 退信提示：550 5.7.1 Recipient rejected (R4)
• 退信提示：421 5.7.1 rejected
• 退信提示：503 Error: need EHLO and AUTH first !
• 退信提示：There was a timeout while talking to the remote server
• 退信提示：451 4.7.0 Temporary server error. Please try again later. PRX4
• 退信提示：554 Transaction failed
• 退信提示：450 4.3.2 try again later