This is interesting information. Howard (E) - how do you go about
finding out if a mail transport program uses things like a command
line argument, a setup file, part of a mail header, or part of a glue
envelope -- when it sends the from and to lines to an smtp server?
I expect at some isps, the From line is always your email address
as they know it, for security reasons -- so you can not fake who
the mail you send out is from, yes?
Howard Eisenberger wrote:
> In my previous message I wrote:
> >
> > An easy way to see what a message with a "glue header" looks like,
> > is to use the glue.exe program that Howard Schwartz mentioned.
> > (Thanks for the tip, Howard).
> >
> > You have to distinguish between the envelope and the data of an
> > email message, which is not the same thing as the headers and the
> > body. The "glue header" contains the addresses that will go in
> > the envelope (mail from and rcpt to). Everything else (headers
> > and body) is in the data portion of the message. They are not a
> > function of the smtp mailer.
> >
> > Similarly, using the .txt/.wrk format, the .wrk file contains the
> > addresses that will go in the envelope (along with the mailhost),
> > while everything else (headers and body) is in the .txt file.
> >
> > Normally the addresses in the envelope will be the same as those
> > in the data portion (From:, To:, Cc:). The glue.exe program takes
> > the addresses from the data and creates a "glue header" which it
> > "glues" to the top of the message so that the message can be sent
> > using a Pegasus type mailer.
> >
> > Similarly the smofsend.exe program will take the addresses from
> > the same message and create a .txt file, which is the message
> > itself, and a .wrk file, so that the message can be sent using a
> > KA9Q type mailer.
> >
> > In both cases it is possible to edit the files before they are
> > sent, so that the addresses in the envelope are not the same as
> > the addresses in the data. The mailer uses the addresses in the
> > envelope.
> Correction:
> Further testing of smtpop12.exe and sendmail.exe has shown that
> these Pegasus type mailers do not behave as I expected. They do
> NOT use the from address ($$) in the "glue header" as the
> envelope from.
> Smtpop uses the address that it has been configured to use in
> maintenance mode, while sendmail uses the address that it is
> given on the command line. The $$ address in the "glue header"
> is ignored.
> The KA9Q type mailers do work as I have described.
> The KA9Q type mailers do work as I have described.
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