Hallo Viktor,

On Mon, 17 Sep 2012 19:03:31 +0200GMT (17-9-2012, 19:03 , where I
live), you wrote:

VK> I have noticed this strange behavior with several messages that I have sent
VK> to myself, while forging the sender address to be my Gmail account.

I can use whatever address in my from header, but not all ISPs accept
that behaviour. Some ISPs only allow your own address as originating
address.
You've got a gmail address and gmail allows sending with none gmail
addresses, though they include a (envelope-from #####@gmail.com)
header.

VK> The issue: the sender field seems blank for these messages in the message
VK> list, though it does show in the message detail.

VK> Apparent cause: Sender address in the form
VK>          [email protected] <[email protected]>
VK> ie repeating the bare mail address in both the name and address token of the
VK> address.
VK> I can reproduce that anytime, just sending myself a message with sender
VK> formed as above.

I can send myself messages from the exact address as you show it, and
that's clearly a bogus address, just depends on the ISP how the
message arrives. My default account (on my own mail server) allows
everything, doesn't add extra headers or anything, but real ISPs have
more concerns as they need to protect themselves against malicious
users. (I only need to protect myself against my own stupidity.)

So my guess is that it's just a matter of a strict ISP.

BTW the @ character has a special meaning in addresses, so if you send
a message with a sender in the [email protected] <[email protected]> format,
then it might be a good idea to change that into "[email protected]" 
<[email protected]>

-- 
Groetjes, Roelof

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