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550: Relaying Not Allowed (port 25)
550: Relaying Not Allowed error can occur for many reasons and it occurs when sending e-mail.
The most common reason is that the ISP (the provider of the internet connection) has blocked the outgoing mail server port from third parties. This means that when you try to send out a message using your ISP's SMTP server, it will go out fine. But, when you try using a third party SMTP (such as your domain's smtp server), you will see this error. ISPs block port25 in order to combat spam and fraud. By forcing all their users to send email out through their SMTP server, they can better monitor the activity of their users (should they ever need to). You have two choices. One, call the ISP and request that they unblock port25. Most will not do so, but some will. Two, you can use your ISP's SMTP server to send out email, and your domain's POP3 to receive. You will need to contact your ISP to find their SMTP server. As long as your settings are configured for your domain name (except the smtp), mail will appear as if it is coming from your domain.
Another reason this occurs is if outgoing mail authentication is required but not enabled. In very rare cases will checking the outgoing mail authentication option resolve this. Your best option is to use the ISP's SMTP server. |
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