Problems Sending Email using Optimum Online or Other Internet Service Providers (ISPs)

If you are receiving an error message which states something along the lines of "Cannot send ougoing mail due to Port 25 being blocked", this usually indicates a problem with your Internet Service Provider (ISP) and NOT Bower Web Solutions itself.

What Is Port 25 and why is it being blocked?
To help control the amount of spam and viruses that originate from your ISP (like Optimum Online or Earthlink, etc.) your Internet Service Provider may start to implement outbound Port 25 (SMTP) filtering. Filtering Port 25 is a common spam control measure used by Internet Service Providers and the advantages far outweigh the disadvantages when it comes to the war on spam. However, these efforts will not necessarily protect yourself from being flooded with spam. To protect your email account from spam, we suggest you take a look at our Spam Control Package.

How can I send my email if my ISP is blocking Port 25?
You will need to change your OUTGOING mail server (SMTP) from "mail.yourdomain.com" or "yourdomain.com" to a SMTP mail server provided by your ISP.

See the list below of leading Internet Service Providers and their Corresponding SMTP (Simple Mail Transfer Protocol) or "Outgoing Mail Server" settings

For example, Optimum Online now require their internet customers use the following SMTP mail server to send out mail on their network:

mail.optonline.net

If you already have your email program (such as Outlook, Outlook Express, Eudora, etc) you do not need to recreate your email account information again. You simply need to edit the existing account and change the SMTP server for the account(s). After you have entered your IPS's SMTP server, you will will then need to click on the 'more settings" tab and go to the "Outgoing Server" tab. On this tab, click on the "Log on using" radio button and enter your ISP username and password. (Note: this is not your Bower Web Solutions user id and password).

IMPORTANT NOTE:
Be aware that many Internet Service Providers (ISP) such as Optimum Online, Verizon, Comcast are now cracking down of "spam activity". These ISPs are now limiting how many emails you can send out from your computer's location within a given time period and may suspend your ability to send email if you are sending more than 30 recipients at a time or more than 50 separate emails within an hour.

Below is an example of changing an exisiting Outlook email account configuration using Optimum Online as an ISP:

  1. Go to the Tools menu and choose "Accounts..."
  2. From the Mail tab, choose your email account and click the "Properties" or "Change" button
  3. In the following window, click on the Servers tab
  4. Change the Outgoing mail (SMTP) server setting to:
    mail.optonline.net
    Note: If your ISP is NOT Optimum Online, then you will need to set your SMTP to a different server. Please contact your ISP directly for more details.
  5. Finally click on the "More Settings" button and enter your ISP username/password in the "Log on Using" section. (see illustration below).

List of Internet Service Providers and Their Respective SMTP/Outgoing Mail Server Settings
NOTE: This list is provided as a courtesy to our customers. As different ISPs change their system configurations, we cannot guarantee complete accuracy with the list below. Please contact your ISP or visit the Support sections of their respective web sites for the most accurate and up to date SMTP settings as required by your Internet Service Provider.

 

If Your Internet Service Provider (ISP)
or Phone Carrier is:
Your STMP Server or "Outgoing Mail Server" Address would be:
Adelphia
mail.adelphia.net
America Online (AOL)
smtp.aol.com
Atlantic Broadband
smtp.atlanticbb.net
AT&T (Broadband)
mail.attbi.com
AT&T (Dialup)
smtp1.attglobal.net
AT&T Worldnet
mailhost.worldnet.att.net or imailhost.worldnet.att.net
BCPL
mail.bcpl.net
Bellatlantic
gtei.bellatlantic.net or smtpout.verizon.net
Bellatlantic.net
smtpout.bellatlantic.net
Bellsouth
mail.bellsouth.net
Bestweb
smtp.bestweb.net
Blazenet
smtp.blazenet.net
Cable One
mail.cableone.net
CAIS
smtp.cais.net
CAPU
smtp.capu.net
Charm.net
smtp.charm.net
Charter Communications
smtp.charter.net
Comcast
smtp.comcast.net
Compuserve
smtp.compuserve.com or smtp.site1.csi.com
Concentric.net
smtp.concentric.net
Covad
smtp.covad.net
Cox West
smtp.west.cox.net (west coast users)
Cox Central
smtp.central.cox.net (central users)
Cox East
smtp.east.cox.net (east coast users)
Cox Business
smarthost.coxmail.com
Crosslink
smtp.crosslink.net
DCANET
smtp-relay.dca.net
Delmarva Online
mail-gw.dmv.com
Delta Net
smtp.deltanet.com
Direcway
smtp.direcway.com
DSL Extreme
smtp.dslextreme.com
Earthlink Network
mail.earthlink.net or smtp.earthlink.net
Earthlink Network (International only)
ismtp.earthlink.net
Edge.net
mail.edge.net
Enter
smtp.enter.net
EROLS
mail.erols.com
Ezy
smtp.ezy.net
Flashcom
mail.flashcom.net or smtp.flashcom.net
Frontline.net
smtp.fcc.net
Gateway.net
smtp.Gateway.net
GTI
mail.gti.net
HotMail
mail.hotmail.com
IBM.Global net
smtp1.ibm.net
ioNet Inc
mail.ionet.net
Interaccess.com
smtp.interaccess.com
Internet America
mail.airmail.net
ITOL
mail.itol.com
Juno
smtp.juno.com
Mediacom
mail.mchsi.com
Mediaone.net
smtp.ce.medione.net
MegaPath
mail.megapathdsl.net
MCI
mailrelay.mciworldcom.net or mailrelay.internetmci.com
Mindspring
smtp.mindspring.com
MSN
smtp.email.msn.com
Nauticom
mail.nauticom.net
Netcom
smtp.ix.netcom.com
Netcom (Canada)
smtp.netcom.ca
Netscape
smtp.isp.netscape.com
NetZero
smtp.netzero.net
NYU.edu
smtp.nyu.edu
OLG.com
mail.olg.com
OPTOnline Internet Service
mail.optonline.net
Pacbell
mail.pacbell.net
Patriot Media
smtp.patmedia.net
Pipeline
smtp.pipeline.com
Prodigy
smtp.prodigy.net
PSI.net
relay.smtp.psi.net
PTD.net
promail.ptd.net port 25
QIS
mail.qis.net
Qwest Internet Service
pop.dnvr.qwest.net
RCN
smtp.rcn.com
Rider.edu
enigma.rider.edu
RoadRunner
smtp-server.<your-region> .rr.com
SBC Global
smtp.sbcglobal.net
SBC Global Yahoo
smtp.sbcglobal.yahoo.com
Smallville Communications
mail.toto.net
SNiP
mail.snip.net
Spectrum DSL
mail.webstable.com
SprintLink
smtp.a001.sprintmail.com
Sprynet
m6.sprynet.com
Starpower
smtp.starpower.net
Sympatico
mailhost.sk.sympatico.ca
UMBC
smtp.gl.umbc.edu
USA.NET
mail.netaddress.usa.net
US Internet
smtp.usit.net
UUNet
mail.uu.net
Verizon Internet Services
outgoing.verizon.net or smtpout.verizon.net
Wide Open West
smtp.mail.wideopenwest.com
XO Communications
mail.njd.xo.com or smtp.concentric.net
Yahoo
smtp.mail.yahoo.com
Ziplink
smtp.ziplink.net

 

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