Email

ID #218

Sending email takes a long time and then fails.

Applies to: Grid System

If, whenever you try to send email from a program on your computer like Outlook or Eudora, it takes a long time to authenticate and then fails, then the reason is most likely because your attempt to relay has been blocked by your Internet Service Provider (dialup modem, DSL, cable, broadband).

More and more ISPs (MSN, Earthlink, Verizon, NetZero, Mindspring, Flashnet, MediaOne, AT&T, AT&T Broadband (ATTBI), Bell Sympatico, etc) do not allow their customers to use outgoing mailservers (smtp servers) other than their own, and enforce that by blocking their customers from accessing any remote servers on smtp Port 25:

Hotmail spam filters block outgoing e-mail
MSN filter sparks subscriber ire
Verizon's Anti-competition Email Policy

The solution to this problem is to contact your ISP and ask them what Outgoing Mailserver they want you to put in your mail program settings.

Another possible cause is that you have a personal firewall running on your computer like Norton Anti-Virus, Black Ice Defender, or Zone Alarm that is not allowing this type of activity. The solution in that case is to either turn off that software, or configure it to allow you to relay mail.

Known ISPs who block remote Port 25/SMTP Access

Your ISP may be blocking your access even if they are not on the list below. Please contact your ISP and ask them for the Outgoing/SMTP server that they want you to use.

ISP Mandatory Outgoing Mail Server
AltaVista Free Access email.1stup.com
AT&T WorldNet mailhost.worldnet.att.net
AT&T BI mail.attbi.com
DCAnet postoffice.dca.net
EarthLink mail.earthlink.net
Microsoft's MSN smtp.email.msn.com
MindSpring smtp.mindspring.com
NetZero smtp.netzero.net
Prodigy Internet smtp.prodigy.net
Sprynet smtp.sprynet.com
Verizon/GTE (Dial-Up) outgoing.verizon.net

 


Last update: 2010-10-03 16:30
Author: FAQ Admin
Revision: 1.2

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Comment of Anonymous:
I dial-up with a local (non-nationwide) ISP. They have also blocked port 25, and require that all SMTP packets go through mail.snowcrest.net. The ISP is SnowCrest.
Added at: 2002-11-05 13:55

Comment of Anonymous:
Cox Communications also blocks port 25.
Added at: 2004-07-08 14:24

Comment of Anonymous:
optimum online is blocking 25 too
Added at: 2003-05-30 10:11

Comment of Anonymous:
Highstream.net, a large discount dialup provider, is blocking access to port 25 on remote servers. I went to www.thelist.com and checked with about five more low-cost dialup providers. All but one said they do the same. Joi at www.joiinternet.com said they are not blocking. I signed up and "we'll see".
Added at: 2003-06-30 12:57

Comment of Anonymous:
Comcast's outgoing SMTP is: smtp.comcast.net
and it requires NO authentication.
Added at: 2004-04-29 18:20

Comment of Anonymous:
A list of major ISP's and their outgoing SMTP email relays:

Actrix Networks - mail.actrix.co.nz
AltaVista.com - email.1stup.com
AOL - rly-ip03.mx.aol.com
AOL - rly-ip04.mx.aol.com
AOL - rly-ip05.mx.aol.com
AT&T - smtp1.attglobal.net
AT&T Business Internet - mail.attbi.com
AT&T Worldnet - mailhost.att.net
Bell Atlantic - smtpout.bellatlantic.net
Blazenet - smtp.blazenet.net
BlueYonder - smtp.blueyonder.co.uk
BusinessServe - smtp.businessserve.co.uk
BTClick - smtp.btclick.com
BT Internet - mail.btinternet.com
BT Openworld - mail.btopenworld.com
Cableinet - smtp.blueyonder.co.uk
Charm.net - smtp.charm.net
Claranet - relay.clara.net
ClearNet - smtp.clear.net.nz
Coastalnet - mail2.coastalnet.com
Compuserve - smtp.compuserve.com
Concentric - smtp.concentric.net
CWCom - smtp.ntlworld.com
Bluelight.com - smtp.mail.yahoo.com
Charter - Pipeline - smtp.charter.net
CalWeb - smtp.calweb.com
Comcast - smtp.comcast.net
Compaq.net - smtp.compaq.net
Crosslink - smtp.crosslink.net
CWnet.com - mail.cwnet.com
DCA.net - smtp-relay.dca.net
Demon - post.demon.co.uk
DirectConnect - smtp.directcon.net
Earthlink - smtpauth.earthlink.net
Easynet - smtp.easynet.co.uk
Erols - smtp.erols.com
Fast.net - relay.fast.net
Freeinet.com - mail.ma.freei.net
Freeserve - smtp.freeserve.co.uk
Gateway - smtp.gateway.net
Genie - mail.genie.co.uk
Globe - Net - smtp.globe.net.nz
GTI - mail.gti.net
IBM.net - smtp1.ibm.net
IC24 - smtp.ic24.net
IHUG - smtp.ihug.co.nz
Iprolink - smpt.iprolink.co.nz
Juno - no relay
Lineone - smtp.lineone.net
LogonAmerica - mail.loa.com
Lycos - smtp.lycos.co.uk
Madasafish - smtp.madasafish.com
MegaNet - smtp.meganet.net
Mindspring - mail.mindspring.com
Mistral - smtp.mistral.co.uk
Mother.com - mail.mother.com
MSN - smtp.email.msn.com
Netcom - smtp.ix.netcom.com
Netlink - mail.netlink.co.nz
Netreach - smtp.netreach.net
Netzero - smtp.netzero.net
Nildram - smtp.nildram.co.uk
NNI.com - nni.com
NTLWorld - smtp.ntlworld.com
OneTel - mail.onetel.net.uk
OptimumOnline - mail.optonline.net
Orcon - mail.orcon.net.nz
PacBell - mail.pacbell.net
PAOnline.com - mail.paonline.com
Paradise - Net - smtp.paradise.net.nz
PeoplePC - mail.peoplepc.com
Pipeline - smtp.earthlink.net
Pipex - smtp.dial.pipex.com
Purplenet - smtp.purplenet.co.uk
Prodigy - smtp.prodigy.net
PSINet - bbr0-f1.sna.com
PSINet - relay.smtp.psi.net
Quadnet - mail.quadnet.net
RCN - smtp.rcn.com
River City Internet - mail.rcip.com
SBC - smtp.sbcglobal.net
Screaming.Net - smtp.tiscali.co.uk
Spire - mail.spire.com
Sprynet - smtp.earthlink.net
StarPower - smtp.starpower.net
Supanet - smtp.supanet.com
Telecom Xtra - smtp.xtra.co.nz
Telewest - smtp.blueyonder.co.uk
Tesconet - mail.tesco.net
Tiscali - smtp.tiscali.co.uk
Totalise - mail.totalise.co.uk
TTLC - mail.ttlc.net
UKGateway - smtp.ukgateway.net
UU.net - alterdial.uu.net
UU.net - mail.uu.net
V21 - smtp.v21.co.uk
Valinet - smtp.valinet.com
Verizon - outgoing.verizon.net
Virgin - smtp.virgin.net
Vispa - mail.vispa.com
Voicenet - mail.voicenet.com
Waitrose - smtpmail.waitrose.com
wcom.net - pop3host.wanmail.net
Webcom - smtp.webcom.com
Which Online - mail.which.net
Worldonline - smtp.tiscali.co.uk
Yahoo - smtp.mail.yahoo.com

Added at: 2004-10-18 20:04

Comment of Anonymous:
You can get around this by simply using Windows Pro SMTP server, and using a different port. Cox and others also block port 80 so you can't run a web server, unless you change the port to something like 8080. THen yuo ahve something like
youipaddress:8080. If that won't work, simply use a port forwading service.
Added at: 2005-02-02 19:24