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hoping someone could help me out. I'm sending out SMTP email with a custom header, e.g x-commId and for a successful email, this header is shown in the received message header (Which is not when I actually need it).

When I send this to an invalid address, the failed response strips out this header (exchange didn't do this). I need this commId to initiate a fallback and disable the email address (via automation). Does anyone have any thought how I could get around this problem of the header going missing.

Zintah
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According to my research, Microsoft Exchange 2010 includes a feature called a header firewall that strips X-headers from untrusted sources (the internet) and this sort of thing exists in some SMTP security gateways too. Many admins will strip almost all non-critical headers off a message as it leaves to obscure any internal information.

For more details: Header firewall

Joy Zhang
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