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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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