This error message is encountered by customers when using their ISP's SMTP server to send out emails to mail accounts within their domain name. The SmartMail is designed to reject emails sent to mail accounts within the domain, if it is coming from a different SMTP server. This aims to block possible mails from spoofed mail accounts.

The workaround for this is to use Doteasy's mail server "mail.yourdomain.com" and assign SMTP Port 587.

Please change 'yourdomain.com' to the domain name in question.

You need authentication in order to send out any emails on our mail server. Please make the following changes to your account settings.

Outlook Express:
Tool -> Account... -> 'mail' tab -> Select mail account -> properties -> 'Server' tab -> check 'My server requires authentication' -> Click 'OK'

Outlook:
Tools -> Email Accounts... -> View or Change existing e-mail accounts -> select your account -> Change... -> More Settings... -> Outgoing Server tab -> check My outgoing server (SMTP) requires authentication -> Use same setting as my incoming mail server

Netscape:
Edit -> Preferences... -> Mail Server -> 'Outgoing Mail Server' Section ensure 'Outgoing Mail Server user name' is filled out. -> Click 'OK'

Edit -> Mail & Newsgroups Account Setting -> Outgoing Server (SMTP) -> enable 'Use name and password' -> enter username 'userid%yourdomain.com' - Click 'OK'

Eudora:
Tools -> Options -> Getting Started -> under 'SMTP Server(Outgoing)' check 'Allow Authentication' -> click 'OK'

Entourage:
Tools -> Accounts -> Select your email account -> Edit -> Click here for advanced sending options button -> Check the box next to SMTP server requires authentication -> Use same settings as incoming mail server.