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How to create Send Connectors using ISP STMP Server

In the fight against spam, more and more Internet service providers require their subscribers to send mail through the ISP's own SMTP servers. If you can't send email because the ISP reject the message or receive this error: The following organization rejected your message: smtp125.sbc.mail.sp1.yahoo.com, you need to create a send connectors using your ISP SMTP server, you may want to create Relay SMTP using your ISP STMP server. These are the steps:

1. Open Exchange Management Console.

2. Navigate to Organization Configuration>Hub Transport>Send Connectors.

3. Follow the Wizard to create the Send Connectors. When setup Network, select Route mail through the following smart hosts, enter your ISP SMTP server (smtp.att.yahoo.com in our case).

4. In Configuration Smart Host Authentication Settings, check Basic Authentication (Uncheck Basic Authentication over TLS.

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