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退信提示：“SMTP error, OPEN：550 Denied by policy.”
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退信提示：“SMTP error, DOT：554 Transaction Failed。”
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退信提示：“SMTP error, DOT：554 sorry, Spam detected by SpamAssassin (#5.3.4).”
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退信提示：“SMTP error, DOT：553 Blocked Using Spam Pattern, Your Message May Contain The Spam Contents.”
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退信提示：“SMTP error, DOT：550 5.0.5 Looks like to Spam”
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退信提示：“SMTP error, DOT： 553 5.7.3 CONTENT REJECT.”
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退信提示：“host [xxx.xxx.xx.xx] said：554 sorry, Spam detected by SpamAssassin (# 5.3.4) (in reply to end of DATA command)”
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退信提示：“DOT：554 this mail is rejected by antispam system”
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退信提示：“DOT：550 spam message rejected”
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退信提示：“DOT：550 Mail rejected”
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退信提示：“bad welcome response from server,554 ip is rejected,smtp auth error limit exceed。”
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退信提示：“582 this message could not be delivered.”
