Dat's a pretty good answer. A 553 response from a mail server is a strong 'cease and desist from further delivery attempts'. In this case, I'd verify with the ISP that they don't have the SMTP server configured to allow delivery attempts to external domains only if the originating system is on their IP block. Sounds to me like they may have this setting enabled on the server and that's why this client is successful only when connected to her ISP. Greg Chapman http://www.mousetrax.com "Counting in binary is as easy as 01, 10, 11! With thinking this clear, is coding really a good idea?" > -----Original Message----- > From: mso-bounce@xxxxxxxxxxxxx > [mailto:mso-bounce@xxxxxxxxxxxxx] On Behalf Of Mark Mucher > Sent: Tuesday, April 22, 2003 10:06 AM > To: mso@xxxxxxxxxxxxx > Subject: [mso] Re: Is it Outlook or my POP3 server? > > > > Does this help? > > Example 1 - the reported error is of the following form: > "The message could not be sent because one of the recipients > was = rejected by the server. The rejected e-mail address was > 'username@xxxxxxxxxxxxx'. Subject 'subject', Account: > 'oceanfree account', Server: 'smtp.oceanfree.net', Protocol: > SMTP, Server Response: '553. To send = mail, first check your > mail with a valid POP account; this prevents = unauthorized > SPAM relaying. (#5.7.1)', Port: 25, Secure(SSL): No, Server > Error: 553, Error Number: 0x800CCC79"=20 > ************************************************************* You are receiving this mail because you subscribed to mso@xxxxxxxxxxxxx or MicrosoftOffice@xxxxxxxxxxxxxxxx To send mail to the group, simply address it to mso@xxxxxxxxxxxxx To Unsubscribe from this group, send an email to mso-request@xxxxxxxxxxxxx with the word "unsubscribe" (without the quotes) in the subject line. Or, visit the group's homepage and use the dropdown menu. This will also allow you to change your email settings to digest or vacation (no mail). //www.freelists.org/webpage/mso To be able to use the files section for sharing files with the group, send a request to mso-moderators@xxxxxxxxxxxxx and you will be sent an invitation with instructions. Once you are a member of the files group, you can go here to upload/download files: http://www.smartgroups.com/vault/msofiles *************************************************************