Memo to self: strip X-Unsent

Thursday, June 19th, 2008 | Articles

One more thought about X-Unsent header that could be used to enable simple integration between Smart Client and Outlook Express (which happens to be the default handler for *.eml files on any bare Windows system or even system with Microsoft Outlook).

It seems that X-Unsent is stripped down by the OE on transmission. However, if it is present, then some some spam fighters may consider that this is the trace of spamming attempt that has not been covered up properly. Since it is so easy to check for this rule (as opposed, for example, to running OCR on the attached image), they could do that.

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