• Adelphia: mail.adelphia.net
• AT&T using an AT&T dial up: mailhost.worldnet.att.net
• AT&T using another network: imailhost.worldnet.att.net
• AT&T Business Internet Services: smtp1.attglobal.net or smtp2.attglobal.net
• BCPL: mail.bcpl.net
• Bell Atlantic: outgoing.verizon.net
• Bellsouth: mail.bellsouth.net
• Bestweb: smtp.bestweb.net
• Blazenet: smtp.blazenet.net
• Charm.net: smtp.charm.net
• Cingular Mobile: mobile.mycingular.com
• Coastalnet: mail2.coastalnet.com
• Columbia: smtp.columbia.edu
• Comcast: smtp.comcast.net
• Compuserve: smtp.compuserve.com
• Concentric: smtp.concentric.net
• Crosslink: smtp.crosslink.net
• Cox Communications: smtp.west.cox.net, smtp.east.cox.net, smtp.central.cox.net
• Delanet: smtp.fcc.net
• DMV: mail-gw.dmv.com
• EarthLink: mail.earthlink.net
• Enter: smtp.enter.net
• Ezy: smtp.ezy.et
• Flashcom: mail.flashcom.net
• Free I.net: mail.nc.freei.net
• Frontline.net: smtp.fcc.net
• GTI: mail.gti.net
• IBM Global: smtp1.ibm.net
• InterPath: mail.interpath.net
• Intetech: smtp.intetech.com
• Intrex: smtp.intrex.net
• IPass: smtp.ipass.net
• MCI: mailrelay.mciworldcom.net
• McLeodusa: email.mcleodusa.net
• Mindspring: smtp.mindspring.com
• Mindspring: mail.mindspring.com
• MSN: smtp.email.msn.com
• Nauticom: mail.nauticom.net
• Netcom: smtp.netcom.com
• NetZero: smtp.netzero.net
• Nuvox: smtp.nuvox.net
• NYU.edu: is4.nyu.edu
• OLG.com: mail.olg.com
• OptOnline.net: mail-hub.optonline.net
• Pipeline: smtp.pipeline.com
• PSI.net: relay.smtp.psi.net
• PSU.edu: smtp.psu.edu
• PTD.net: mail.ptd.net
• QIS: mail.qis.net
• RCN.com: smtp.rcn.com
• Rider.edu: enigma.rider.edu
• RoadRunner: smtp-server.nc.rr.com
• SBC Global/Pacific Bell: mail.sbcglobal.net
• Splitrock.net: email.mcleodusa.net
• SprintPCS: smtp.sprintpcs.com
• Sprynet: smtp.sprynet.com
• Starpower: smtp.starpower.net
• Sysnet: mail.sysnet.net
• TDS Telecom: smtp.tds.net
• Tesla Tech: smtp.tes-tech.net
• UMBC: smtp.gl.umbc.edu
• UUNet: mail.uu.net
• Verizon: outgoing.verizon.net
• XO: smtp.concentric.net
• Ziplink: smtp.ziplink.net

If you see an ISP that needs to be added to this list please email sysadmin@substorm.com.