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Sending email takes a long time and then fails.

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

User-Contributed Notes

05-Nov-2002 13:55

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.

user -at- example.com
30-May-2003 10:11

optimum online is blocking 25 too

30-Jun-2003 12:57

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".

29-Apr-2004 18:20

Comcast's outgoing SMTP is: smtp.comcast.net 
and it requires NO authentication.

daniel -at- hawton.org
08-Jul-2004 14:24

Cox Communications also blocks port 25.

18-Oct-2004 20:04

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

user -at- example.com
02-Feb-2005 19:24

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.

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