02-23-2010
You need to get sendmail not to use DNS on your local machine so your host doesn't trying to connect to your ISP for a DNS query.
You also need to designate a "smart host" or external relay to handle all mail that you can't deliver locally (this would be your ISP's mailhost).
You need to configure it so that the smtp mailer is considered "expensive" by adding the F=e mailer flag and tell sendmail not to connect to expensive mailers by default by setting the HoldExpensive option to True.
You need to add mydomain.com to the sendmail.cw file or the Cw line in the sendmail.cf.
Finally, you need to run a program periodically to check in with your ISP and get them to deliver any mail they may have queued for you.
sendmail - config help?
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LEARN ABOUT DEBIAN
sensible-mda
SENSIBLE-MDA(8) System Manager's Manual SENSIBLE-MDA(8)
NAME
sensible-mda - a generic local MDA router for Debian systems
SYNOPSIS
sensible-mda from to detail client-addr
DESCRIPTION
sensible-mda is used to simplify the installation and configuration of sendmail(8) , or other MTAs for use on Debian systems. With sensi-
ble-mda, sendmail can support a plethora of MDAs (procmail, maildrop, deliver, etc.) without having pick any one of them as required.
FUNCTION
sensible-mda is called by sendmail as a local mailer when the following exists in sendmail.mc:
define(`LOCAL_MAILER_ARGS', `sensible-mda $g $u $h ${client_addr}')dnl
sensible-mda will look for the following MDAs (in this order), and pass the mail on to the first SUID MDA found (Or first found MDA, if run
w/euid=root): procmail(1), maildrop(1), deliver(8), mail.local(8)
OPTIONS
Available command line options are the following:
from The sender of this email (sendmail $g variable)
to The recipient of this email (sendmail $u variable)
detail The detail portion of the recipient userid (sendmail $h variable) - ie:
cowboy+sendmail@debian.org
client-addr
TCP/IP address of the sender (sendmail ${client_addr} variable) Not used (for the nonce)
FILES
/etc/mail/sendmail.mc
sendmail m4 input to generate sendmail.cf
/etc/mail/sendmail.cf
actual sendmail configuration file (treated as a binary file)
SEE ALSO
sendmail(8), procmail(1), maildrop(1), deliver(8), mail.local(8)
BUGS
None known so far.
AUTHOR
Richard Nelson <cowboy@debian.org>
HISTORY
4th Berkeley Distribution October 21 1999 SENSIBLE-MDA(8)