At 5:16 PM +0100 2004-06-30, Ian A B Eiloart wrote:
> 1. When I post to my mailming list the From address comes like > "[EMAIL PROTECTED]". Why can't I have the from address as > the address of the sender?
Because that's where bounces go, and you want automatic unsubscription to work, don't you?
And, as a subscriber, I don't want all the bounce messages coming to me! As Ralf says, let mailman see the bounces and deal with them.
No, that's wrong. The question was about the "From:" address. Bounces go to the "Sender:" address. The from address has to be the person who composed the message. The sender address is the agent that sent it to the recipient.
There is the header "From:" field, and then there is the envelope sender address. The latter is sometimes indicated as something like:
From <[EMAIL PROTECTED]>
In particular, note the lack of a colon after the word "From". This is sometimes indicated as the "From_" address, where the underscore character is understood to stand for a space character in this usage.
It is not exactly clear to me which one is being referred to here. The original quote does not indicate a colon after the word "From:", but I'm not 100% certain as to whether or not the author was aware of this connotation.
Note that some MTAs will promote the envelope sender address into the header "From:" field (especially if no header "From:" field exists), and some MUAs display an address listed in the "Sender:" field in addition or in place of the "From:" field (if they are different).
Bounces are sent to the envelope sender address, which may or may not be recorded in the "Sender:" field, or elsewhere in the message. It's important to distinguish between the envelope sender address and the contents of the "From:" and "Sender:" fields, because the envelope sender address may be lost or irretrievably altered once the message is received.
You should never attempt to bounce a message to any address in any header field -- you should always bounce back to the actual envelope sender address. This obviously causes problems if the envelope sender address is lost or irretrievably altered.
-- Brad Knowles, <[EMAIL PROTECTED]>
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
-Benjamin Franklin, Historical Review of Pennsylvania.SAGE member since 1995. See <http://www.sage.org/> for more info.
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