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I've noticed that email forwarding to an address seems not to work if I send an email from the address to which I am forwarding email. This happens for GMail and Fasthosts mail servers. e.g I send an email to from , is set to forward to and the email never arrives.

I realise this seems logical but it is a potential cause of confusion when testing email functionality in a web application (for me, anyway ;-). I would just like to know if this is standard for all MTA software so I can avoid confusing myself.

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No, it is in no way "standard" to block mail in this manner. I suspect whatever problem you are experiencing was caused by something else entirely, but it's difficult to say what without a lot more information.

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