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Spammers use the relaying ability of SMTP servers to mask the true origin of junk email by relaying it through third-party servers that permit such open relays.

This makes the junk email appear to come from the site that relays the message and conceals the identity of the real sender.

The SMTP server must connect to another SMTP server to relay the message.

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Para: [email protected]: Undelivered Mail Returned to Sender This is the mail system at host mail182-ch112-RR.

I'm sorry to have to inform you that your message could not be delivered to one or more recipients. For further assistance, please send mail to postmaster. You can delete your own text from the attached returned message.

When you use an email program, such as Outlook, that lets you store your email messages on your computer, you need access to an SMTP server to send email messages.

Unsolicited commercial email is sometimes called junk mail or spam.

The mail system : host zsca-138961-mail2.customer.somethingbridge.com[] said: 554-Transaction failed (id=4FE8B30610BE0008), maximum 8 recipients listed below: 554-Address:[email protected]_to_Server:999.5 Command: EODT Error:554 5.7.1 Message refused by DNSBL check. The email message was detected as spam 554 Transaction failed (in reply to end of DATA command) Hating to state the obvious, but the problem is that some of your users' emails are being rejected as spam.

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