RE: Authenticated Outgoing Mail
- From: "EIS Lists" <eis_lists@xxxxxxxxxxxxx>
- To: "'[ExchangeList]'" <exchangelist@xxxxxxxxxxxxx>
- Date: Fri, 16 Sep 2005 17:10:29 -0700
Hi -
Wow! Didn't mean to start an RFC battle ;-)
In there somewhere, someone asked "why is this guy doing this?" The answer
is that many of my laptop users hop from home network to coffee shop to
someone elses office. Many of those sites use ISPs that require you to use
their SMTP servers or your own via authenticated SMTP. It seems like the
latter solution would allow the users to set their SMTP settings once and
leave it as opposed to changing those settings every time they change
locations.
Maybe the better question is: what is the best way to handle this?
Below is an example of the policy described by SBC:
As announced in the September 2004 Member newsletters, SBCIS began filtering
direct outgoing email connections using Port 25 (SMTP) to non-SBCIS/Yahoo
mail servers from Members using dynamic DSL and Dialup connections. Port 25
filters are widely used by many ISPs to combat junk email and spam from
mis-configured and virus-infected computers.
SBCIS Members using SBCIS or Yahoo! mail servers for outgoing email are not
impacted by this filter. Incoming email connections are also not affected.
Members using a private company, university or hosting provider mail server
will not be able to send outgoing email from dynamic DSL and Dialup
connections until one of the following actions are taken:
1. Contact your mail hosting provider for information about using Port
587 for sending authenticated outgoing email. Since December 1998, Port 587
has been the Internet standard (RFC2476) port for authenticated email
submission for mail clients and is supported by most major mail hosting
providers.
2. Contact your mail hosting provider for information about using other
alternative access methods to connect to their mail server, such as VPN, Web
mail or Outlook Web Access to send outgoing email.
3. SBCIS Members may send outgoing mail messages through SBCIS mail
servers, even if they use other email domains in their mail address, by
converting their Outgoing mail (SMTP) to use
<http://help.sbcglobal.net/article.php?item=285> SBC mail servers. Members
should not change their Incoming mail server (POP3/IMAP).
4. SBCIS Members who can not use any of the preceding alternatives may
request that SBCIS remove the SMTP port 25 filter from the Member's account.
To request removal of the filter, use the Abuse of Service form at
<http://help.sbcglobal.net/servabuse.php>
http://help.sbcglobal.net/servabuse.php to contact our Abuse team and choose
the "Opt-Out Port 25" under Abuse Type. Enter your account Member ID (also
called your SBCIS PPPOE Login ID or User ID) to opt-out. If you have
multiple SBCIS accounts you want to opt-out, please submit a separate form
for each Member ID. Do not enter your email addresses from the other mail
hosting provider. You should expect that it will take SBCIS 12-24 hours to
process your request.
After receiving a confirmation email, sent to the SBCIS Member account ID
being opted-out, you will need to logoff the SBCIS network and turn off your
DSL router or modem for 1 minute to remove the filter. You should then turn
your modem and system back on and log in using the normal procedure.
_____
From: Karl Freeth (Datasys) [mailto:karl@xxxxxxxxxxxxxx]
Sent: Friday, September 16, 2005 12:46 AM
To: [ExchangeList]
Subject: [exchangelist] RE: Authenticated Outgoing Mail
http://www.MSExchange.org/
You could create a virtual SMTP server to listen on your required port
Karl
_____
From: John Tolmachoff (Lists) [mailto:johnlist@xxxxxxxxxxxxxxxxxxx]
Sent: 15 September 2005 23:09
To: [ExchangeList]
Subject: [exchangelist] RE: Authenticated Outgoing Mail
http://www.MSExchange.org/
I am not sure if Exchange can be configured to listen on 587 in addition to
25, but it is accepting inbound authenticated connections is what you meant.
A work around (as long as your Exchange server is properly configured) is to
add an inbound rule to your firewall (you are running a firewall aren't you)
to redirect incoming port 587 traffic on the external interface to port 25
on the internal destination.
John T
eServices For You
-----Original Message-----
From: EIS Lists [mailto:eis_lists@xxxxxxxxxxxxx]
Sent: Thursday, September 15, 2005 2:54 PM
To: [ExchangeList]
Subject: [exchangelist] Authenticated Outgoing Mail
http://www.MSExchange.org/
Hello:
We have several users who access their Exchange accounts via POP and SMTP.
Recently, several large ISPs have started blocking outbound traffic that
does not use their servers. Is there a way to tell Exchange 2000 to use
authenticated outbound connections (e.g., over port 587)?
Thanks.
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