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What is a flagged email?

would this header cause the email to be flagged as suspect?

  • Authentication-Results: [snip].mail.[snip].[snip].com from=someDomain.com; domainkeys=neutral (no sig); from=someDomain.com; dkim=neutral (no sig) Received: from 127.0.0.1 (EHLO smtp1.someOtherDomain.net) (1.23.45.67) by [snip ...] Received: from someOtherDomain.net ([1.23.45.89]) by smtp1.someOtherDomain.net Email from people who work at a company whose associated domain is "someDomain.com" is forwarded to a mail hosting company,"someOtherDomain.net", via SMTP, and the email gets sent out by someOtherDomain.net to the receipient. The IP addresses (1.23.45.67) and (1.23.45.89) are, of course, obscured here, and they are associated with someOtherDomain.net, not with someDomain.com. If a header like the one above were received at a company with fairly strict mail filters, such as a major bank, would it typically get trapped or flagged by the filters as suspect, either as potential spam or phishing, or anything else? When dkim = "neutral (no sig) and domainkeys="neutral (no sig)" is that a sign to a strict filter than the email may be from a fly-by-night organization, so to speak?

  • Answer:

    DKIM is going to hold a lot less weight than other things, such as spf and PTR. Most likely, you will have no trouble.

Tim at Server Fault Visit the source

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Short answer is that it may not be blocked based on dkim=neutral alone. But it is hard to say for sure, since they may or may not be using any number of filters. The only item to base an answer on is that your stating the assumption that they are use a "strict filter" whatever that is. The best way to tell is to just send them an email and ask the email admins (or the recipient of email) to tell you why (or why not) your email did (or didn't) make it through the filter.

Patrick R

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