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5.7.1 Relaying not allowed

If you are receiving the "5.7.1 Relaying not allowed" error message in your Outlook email client, your ISP is most likely blocking the ability for you to use a third-party smtp server, ie: mail.your-domain-here.com. To solve this error, you have to use your ISP's smtp server as your outgoing mail server in Outlook.

The following links are websites that has a list of known ISP that block the use of third-party smtp servers.

The list:

Earthlink Internet service: smtp.earthlink.net

MSN Internet service: smtp.email.msn.com

Verizon Internet service: outgoing.verizon.net

Qwest Internet service: pop.dnvr.qwest.net

OPTOnline Internet service: mail.optonline.net

SBC Internet service: smtp.sbcglobal.yahoo.com

SCB (Pacbell): mail.pacbell.net

SCB (SBC Global): smtp.sbcglobal.net

Comcast Internet service: smtp.comcast.net

At&T Broadband Internet service: mail.attbi.com

NetZero: smtp.netzero.com

RCN: smtp.rcn.com

DSLExtreame: smtp.dslextreme.com

MegaPath: mail.megapathdsl.net

Cable One: mail.cableone.net

XO Communication: mail.njd.xo.com

Cox Internet: Find your SMTP server based on your State: Cox Internet State-specific SMTP server names.



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