最新资讯_专业邮件中继，反垃圾网关，海外邮件中继，邮件中继转发服务，邮件中继服务器

·500 5.0.0 Service unavailable	[2016-5-9]
·501 This server will not accept forged credentials	[2016-5-9]
·550 Sender frequency limited	[2016-5-9]
·553 can't verify FROM domain in DNS；domain does not exist	[2016-5-9]
·450 Client host rejected: cannot find your hostname	[2016-5-9]
·552-5.2.3 Your message exceeded Google's message size limits	[2016-5-8]
·550 5.7.606 Access denied, banned sending IP	[2016-5-8]
·451 Temporary internal failure, please contact your email administrator	[2016-5-8]
·501 Bad address syntax	[2016-5-8]
·550 Ip frequency limited	[2016-5-8]
·网易邮箱常见退信说明	[2016-5-8]
·No mail servers appear to exists for the recipient's address	[2016-5-8]
·553 Blocked Using Spam Pattern, Your Message May Contain The Spam Contents	[2016-5-7]
·553 you don't authenticate or the domain is not allowed relay	[2016-5-7]
·Recipient address rejected: Access denied	[2016-5-7]
·421 4.3.2 Service not available	[2016-5-7]
·554 Sorry, message looks like SPAM to me	[2016-5-7]
·The DNS query has failed，MX/IP resolved failed	[2016-5-7]
·Remote server closed connection的原因分析	[2016-5-7]
·552 Requested mail action aborted: exceeded storage allocation	[2016-5-7]
·554 5.7.1 Recipient address rejected: receiving function of recipient is limited	[2016-5-7]
·550 Local user only or Authentication mechanism	[2016-5-7]
·501 Connecting IP must have valid PTR，554 invalid DNS PTR resource record	[2016-5-7]
·451 Service unavailable	[2016-5-7]
·550 #5.1.0 Address rejected.	[2016-5-7]
·453 Mail queue error	[2016-5-7]
·550 5.7.1 Relay access denied	[2016-5-7]
·554 5.7.1 You are not allowed to connect	[2016-5-7]
·550 mailbox rejected	[2016-5-7]
·554 Zodiac RBL hit, please contact...	[2016-5-7]

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