====================== Both are typically setup to require authentication these days (although SMTP didn't use to be) so it's not unusual to have to set your SMTP settings to require you to authenticate before sending. ====================== Still, MANY do NOT use explicit SMTP suthorization and rely, instead, on the POP authorization first. Hence the part of the message that says: 553. To send mail, first check your mail with a valid POP account; this prevents = unauthorized SPAM relaying. My current web host for my personal/hobby site, for example, uses this approach. And, some ISPs use this approach instead of explicit SMTP authorization when people are not connected "directly" to them but wish to access their SMTP. As for the "rationale" . . . interesting. Still, it has forced me to use a variety of "tricks" to inhibit sending until I can receive to establish authentication. James S. Huggins ... ************************************************************* 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 *************************************************************