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	Postfix ETRN Howto
		ETRN service is no longer available for domains that aren't configured for the service.
		These attempts are separated in time by increasing time intervals, ranging from $minimal_backoff_time to $maximal_backoff_time, and should not be a problem unless a lot of mail is queued.
		By default, "fast ETRN" service is enabled for all domains that match $relay_domains.
	www.postfix.org /ETRN_README.html (1283 words)

	ETRN - Wikipedia, the free encyclopedia
		ETRN (Extended Turn) is an extension to the SMTP e-mail protocol.
		Some level of security is provided by DNS-based authentication of the initiating server.
		The ETRN operation is useful for intermittently connected mail servers.
	en.wikipedia.org /wiki/ETRN (92 words)

	Zvon - RFC 1985 [SMTP Service Extension for Remote Message Queue Starting] - The extended ETRN command
		The extended ETRN command is issued by the client host when it wishes to start the SMTP queue processing of a given server host.
		The syntax of this command is as follows: ETRN [
		When the server host receives the ETRN command, it should have a look at the node name that is specified in the command and make a local decision if it should honour the request.
	www.zvon.org /tmRFC/RFC1985/Output/chapter5.html (858 words)

	ETRN Tab
		ETRN defines a method of queueing mail for a mail server which does not have a permanent connection to the Internet.
		ETRN is similar to the smart POP collection that i-Mail does, except is is a 'push' mechanism where the ISP is in control if the mail sending, where with POP collect i-Mail controls the downloads.
		The ETRN activators are scheduled by the inbound scheduler on the Scheduling tab.
	www.imailds.com /Manuals/300/Adm_ETRN.htm (450 words)

	The Danger of ETRN
		The extended SMTP command ETRN as described in RFC1985 and implemented in Exchange Server 5.0 beginning with Service Pack 1, is an attempt to address the inability of the SMTP protocol to function over dial-up connections between SMTP servers.
		Most organizations considering ETRN, are doing so because of the cost savings of a dial-up or ISDN connection versus a dedicated line or because DSL is not available in their area.
		ETRN takes advantage of misusing the ISP's Mail Server queuing mechanism which is intended only to provide a fail-safe for a temporarily failed communications line.
	www.jak.com /ETRN.htm (907 words)

	[No title] (Site not responding. Last check: 2007-11-03)
		ETRN was introduced in RFC 1985, published in 1996.
		The parameter to an ETRN request is normally a domain name.
		There is an ETRN extension, with no arguments allowed, that promises support for the ETRN verb.
	cr.yp.to /smtp/turn.html (340 words)

	SkyPoint Communications - Internet Service Provider - ISP - Minnesota
		ETRN Configuration Many dial on demand sites experience burst delivery of their mail which may or may not coincide with their connectivity to their provider.
		ETRN is a facility offered by many SMTP mail hosting sites that allows one to make the delivery more predictable.
		ETRN can be used to short-circuit the queue run timing so that your mail can be dequeued and received immediately.
	www.webspan.com /help/etrn.php (255 words)

	Simpler-Webb - Resources - Exchange - SMTP
		The ETRN command is defined to cause mail for a particular domain(s) to dequeue.
		Since ETRN is simply another token that the SMTP protocol can pass, some method must be designed to connect to the host on the SMTP port (TCP 25), send the ETRN command, then quit.
		ETRN is supported natively in Exchange 5.0 SP1 and later.
	www.swinc.com /resource/exch_dq_sendmail.htm (717 words)

	ETRN and ATRN ODMR Mail Backup (Site not responding. Last check: 2007-11-03)
		ETRN is a network service that provides additional fail-over for your email system.
		Because it functions off-site it can capture mail in case of network outages and because it is distributed through 5 data centers it can route your mail even in the case of a major provider going offline.
		ETRN is housed at multiple data centers and uses intelligent routing to get around any big provider outages.
	www.ownwebnow.com /managed/etrnatrn.php (312 words)

	rfc1985
		The extended ETRN command The extended ETRN command is issued by the client host when it wishes to start the SMTP queue processing of a given server host.
		5.2 Client action on receiving response to extended ETRN command If one of the 500 level error codes (550 or 551) are sent, the client should assume that the protocol is not supported in the remote host or that the protocol has not been implemented correctly on either the client or server host.
		5.3 Use Of ETRN to release mail for a subdomain or queue If the requesting server wishes to release all of the mail for a given subdomain, a variation on the ETRN command can be used.
	ietfreport.isoc.org /idref/rfc1985 (1894 words)

	What's new in sendmail 8.8?
		ETRN You can now request to flush the queue for your host.
		Implement ESMTP ETRN command to flush the queue for a specific host.
		RFC 1985 describes the new ETRN command, which is a safer version of the old TURN command, to start sending messages to rarely connected hosts.
	www.sendmail.org /~ca/email/sm8.8.new.html (1020 words)

	What options can other servers use to request email using the ETRN extension?
		ETRN by itself is not a completely secure command so the ETRN utility additionally provides the capability of password protecting mail queues.
		This means send all mail for domain.com to server.domain.com on port 25 but only send when an ETRN request is made using the specified password in plain text.
		This means that the machine issuing the ETRN command can have a dynamic IP address and doesn't have to have a valid A record in DNS.
	www.gordano.com /kb.htm?q=67 (662 words)

	Servicing ETRN Domains - Hula (Site not responding. Last check: 2007-11-03)
		ETRN Domains are messaging systems that use a hosting service, such as an ISP or ASP, to send and receive messages over the Internet.
		The ETRN command indicates to the hosting server that the remote site is on line and to send the queued messages for this domain.
		When the hosting server receives the ETRN domain command from a remote server, it issues a command to its NMAP agent to send all messages queued for the remote domain.
	www.hulaproject.org /Servicing_ETRN_Domains (716 words)

	Using ETRN with WorldMail 3
		ETRN allows a remote server with intermittent connectivity, such as those using a dialup connection, to obtain mail queued for them by the WorldMail 3 Server.
		WorldMail 3 also supports Authenticated ETRN, which ensures the SMTP client is authenticated (using the AUTH command with a valid mailbox name and password).
		When the customer then connects to WorldMail 3 using the ETRN command (with the MSSTART utility for example), mail will be delivered to their server.
	www.eudora.com /techsupport/kb/2597hq.html (428 words)

	ETRN Service (MX backup)
		If you are currently running your own Exchange® 2000 Server/Lotus Domino® (or others), but do not have a permanent connection to the Internet, you can use our ETRN Service (secondary mail server backup) to retrieve your network's email.
		ETRN service provides a mail queue for the hosts that do not have round the clock connections.
		The monthly throughput (Data Transfer) generated (calcolated in Mbytes) will be compared with the Hosting Service (traffic limit) actived for this purpose.
	www.netregister.biz /servizioetrn.htm (230 words)

	etrn(1M) (Site not responding. Last check: 2007-11-03)
		SMTP's ETRN command allows an SMTP client and server to interact, giving the server an opportunity to start the pro- cessing of its queues for messages to go to a given host.
		The etrn utility initiates an SMTP session with the host server-host and sends one or more ETRN commands as follows: If no client-hosts are specified, etrn looks up every host name for which sendmail(1M) accepts email and, for each name, sends an ETRN command with that name as the argument.
		Example 1: Using etrn Inserting the line: ETRN_HOSTS="s1.domain.com:clnt.domain.com s2.domain.com:clnt.domain.com" in /etc/default/sendmail results in /etc/init.d/sendmail invoking etrn such that ETRN commands are sent to both s1.domain.com and s2.domain.com, with both having clnt.domain.com as the ETRN argument.
	www.cs.duke.edu /cgi-bin/man.cgi?section=1M&topic=etrn (363 words)

	PMDF System Manager's Guide (Site not responding. Last check: 2007-11-03)
		When the connection is brought up and one side sends to the other, via the ETRN command the SMTP client can also tell the remote side that it should now try to deliver any messages that need to travel in the reverse direction.
		The SMTP client specifies on the SMTP ETRN command line the name of the system to which to send messages (generally the SMTP client system's own name).
		If the remote SMTP server supports the ETRN command, it will trigger execution of a separate process to connect back to the named system and send any messages awaiting delivery for that named system.
	www.cuis.edu /pmdf_root/doc/html/sysman/book_53r.html (210 words)

	ETRN Setup (Site not responding. Last check: 2007-11-03)
		ETRN is an extended function of the SMTP server.
		Use the ETRN option of SMTP to request mail delivery from a specified mail system queue as an alternative to POP3 distribution.
		Note: To successfully use ETRN download, a task must be set up in the Scheduler that is specifically assigned to retrieving ETRN mail.
	www.magicwinmail.net /help/etrnoptions.html (201 words)

	The problem with ETRN (Site not responding. Last check: 2007-11-03)
		ETRN is turned off with PrivacyOptions=restrictqrun but I can't see the privacy issue.
		I can guess DoS if anyone at all can run your queue and maybe make hundreds of connections to do that, but if they are making hundreds of connections to port 25 anyway, that doesn't seem a huge issue (I mean, processing the queue on top of the rest).
		I'd like to have ETRN on, and I wonder what others are doing.
	www.cm.nu /~shane/lists/comp.mail.sendmail/2000-10/1925.html (177 words)

	ETRN - a Whatis.com definition (Site not responding. Last check: 2007-11-03)
		ETRN (Extended Turn) is an extension to the Simple Mail Transfer Protocol (SMTP) that allows an SMTP server to send a request to another SMTP server to send any e-mail messages it has.
		ETRN is designed for use by anyone who is traveling and wants to get access to their mail.
		ETRN can only be used with Internet service providers that support ETRN.
	searchnetworking.techtarget.com /gDefinition/0,294236,sid7_gci214540,00.html (174 words)

	What is ETRN?
		ETRN (Extended Turn) is an extension to the Simple Mail Transfer Protocol that allows an SMTP server to send a request to another SMTP server to send any e-mail messages it has.
		A dial-up mail server can connect to the Gordano GMS Mail server and issue the ETRN command to force all the e-mail for its server to be posted out.
		The ETRN command may be issued at any time once a session is established, as long as there is not a transaction occuring.
	www.gordano.com /kb.htm?q=817 (378 words)

	ETRN Setup (Site not responding. Last check: 2007-11-03)
		ETRN service provides mail spooling service for hosts that do not have a full time connection.
		On the mail server, an ETRN account is like an email holding station.
		There is only a command in the Preferences to hold mail until the ETRN server connects and collects the mail from us.
	bonnie.baka.com /tech_pages/eims/etrn.html (136 words)

	RFC1985 (Site not responding. Last check: 2007-11-03)
		RFC 1985 SMTP Service Extension - ETRN August 1996 single parameter, the name of the remote host(s) to start the queues for, the server can decide whether it wishes to respect the request or deny it for any local administrative reasons.
		RFC 1985 SMTP Service Extension - ETRN August 1996 If the 250 response is received, then the client host can assume that the server host found its request to be satisfactory and it will send any queued messages.
		This command does not compromise any security considerations of any existing SMTP or ESMTP protocols as it merely shortens the time that a client needs to wait before their messages are retried.
	www.rfc.net /rfc1985.html (1903 words)

	ETRN Polling E-mail (Site not responding. Last check: 2007-11-03)
		You can use any software that supports ETRN polling such as Microsoft Exchange for Windows platforms or Sendmail for Unix or Linux platforms.
		Running your own server allows you to add, delete, or modify users on your own server and to impliment any spam filtering or virus scanning solutions you deem appropriate on your server.
		ETRN polling can also be provided as the E-mail delivery mechanism with a virtual domain in which case there are no additional fees beyond the cost of the virtual domain and the account that it is mapped to.
	www.eskimo.com /services/etrn.html (184 words)

	XFOR: Queued Message Waiting for ETRN Never Expires
		However, when this problem occurs, the queued message, which is waiting for the ETRN command, remains in the outgoing queue and never expires after the scheduled time.
		After the remote host submits the ETRN command to the Exchange Server computer, a new connection is established from the Exchange Server computer to the remote host.
		If the queued message is waiting for the ETRN command, the message never expires even after the scheduled time.
	support.microsoft.com /kb/184051/KO (369 words)

	BackOffice Server 2000 and Small Business Server 2000 ETRN Warning in "Component Messages" Dialog Box During Setup ... (Site not responding. Last check: 2007-11-03)
		TURN, ATRN, and ETRN are SMTP processes that you can use to poll a remote SMTP host intermittently for mail that is destined for a specific domain.
		When the SMTP connector is connected, it sends a TURN, ATRN, or ETRN request (which one depends on your configuration) to the remote server and removes from the queues any SMTP mail that is requested by the command that was issued.
		As a result, the TURN, ATRN, or ETRN request is denied and the server is in a state where the SMTP service stops responding (hang).
	www.sunsite.org.uk /sites/ftp.microsoft.com/MISC/KB/en-us/279/517.HTM (590 words)

	Re: Patch to vrfy to issue ETRN command for sendmail 8.8 (Site not responding. Last check: 2007-11-03)
		Re: Patch to vrfy to issue ETRN command for sendmail 8.8
		Prev by Date: Patch to vrfy to issue ETRN command for sendmail 8.8
		Previous by thread: Patch to vrfy to issue ETRN command for sendmail 8.8
	www.imc.org /ietf-smtp/old-archive/msg02353.html (177 words)

	Patch to vrfy to issue ETRN command for sendmail 8.8 (Site not responding. Last check: 2007-11-03)
		From the changes I made in the vrfy man page: vrfy(1) ETRN MODE If the -T option is specified, the program enters a special ETRN mode.
		If the SMTP server supports the ETRN request defined in RFC 1985, then the ETRN command will be sent with the parameter of the hostname of the local host.
		Currently sendmail 8.8 supports the ETRN command The patch is available from: ftp://ftp.harker.com/pub/sendmail/vrfy/vrfy.etrn.patch vrfy is available from the same location or: ftp://ftpnikhef.nl/pub/network/vrfy.tar.Z Visit my web page for more information: http://www.harker.com/sendmail/sendmail-ref.html This page also contains HTML versions of the sendmail 8.8 documentation.
	www.imc.org /ietf-smtp/old-archive/msg02352.html (279 words)

	Re: [Snort-users] SMTP ETRN overflow attempt
		The the DMail ETRN vulnerability is a classic linear buffer overflow attack.
		It's going to consist of the text "ETRN" (any case) followed by 500 bytes of arbitrary data (can be absolutely anything with no CRs), followed by exploit code (can vary).
		Also note that this rule is coded to only look for this data at the start of a packet.
	lists.virus.org /snort-users-0305/msg00125.html (281 words)

	ExchangeDefender ETRN Guaranteed Delivery (Site not responding. Last check: 2007-11-03)
		ETRN allows us to hold mail for your mail server in an active queue until your mail server or Internet connection recover.
		ETRN will hold mail in an active queue for up to 7 days, allowing you plenty of time to come back even after a catastrophic server failure.
		The first time your mail server goes down or rejects a message, ExchangeDefender will attempt to deliver the queue once a minute for the period of 15 minutes.
	www.exchangedefender.com /etrn.asp (184 words)

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