[EMAIL PROTECTED] writes:
>
> How does mail go from A to B,i.e if send mail from [EMAIL PROTECTED] to [EMAIL PROTECTED]
> then how the hops determined (as we see in the headers).Also were can i
> get more info concerning the email header like X-Sender etc.
> Tia
> Sapsi
> [EMAIL PROTECTED]
The DNS servers are your answer. Each domain's DNS server will have
a MX entry in the config files which will be returned when sendmail
queries that domain for its MX records. Generally, it is
recommended that you have two entries, one with 10 as preference
level and the other as 20. These are the only hops that you will
generally encounter in two upfront domains sending mails to each
other.
However, these days, more often than not, you see that the headers
contain more then two mail re-routings. Well that is because
A- some administrators are worried (read as paranoid) about
security. Thus they put the mail server deep inside the domain with
a skirting system outside the firewall. B- your email address is
actually an alias "[EMAIL PROTECTED]" for "[EMAIL PROTECTED]".
This is generally true for those corporate (read brain dead) systems
where you can have "[EMAIL PROTECTED]" adds.
This effectively means that the mails are being routed through two
different systems to be dropped into your real email which is far
from human friendly.
As regards to the X-Sender headers, you can add as many headers as
you want and clutter the whole thing up, so long as you use X- to
start the header. One good tool to do that is "procmail" or if your
mail reader can give you a raw editing mode like Emacs, you can just
add it by hand.
I do not remember the RFC numbers off hand, but if you dig enough,
you will get all this embedded deep inside the noise of the
humongous RFCs.
-amlan.
--
Amlan Saha [EMAIL PROTECTED]
http://www.cwc.nus.edu.sg/~cwcamlan [EMAIL PROTECTED]
--
To unsubscribe, send mail to [EMAIL PROTECTED] with the body
"unsubscribe ilug-cal" and an empty subject line.
FAQ: http://www.ilug-cal.org/faq/listfaq.html
