Hello everyone, my english is not very good, so sorry for my mistakes. in my companyrunning MS SBS 03 exchange. and the problemis with sending emails from outsidecompany lan. users are using MS outlook 03. i try to explain the problam: usersthat are incompany lancan send emails to outsidemailboxes (from user@mycompany.com to user@gmail.com )and to insideuser (from user@mycompany.com to user1@mycompany.com).But some users using mail on the trip or at homeand they want to use MS Outlook 03. I configured imap emails accounts in users outlook and became problam with sending email to outside. then user are outside of company lan he can send emails just to company users (from user@mycompany.com to user1@mycompany.com), but NOT to another users, wich have email account in another server(from user@mycompany.comCAN NOT sendto user@gmail.com). He becames message that "Your message did not reach some or all of the intended recipients" with error "554 user@gmail.com: Relay access denied". email addresses to wich he send emails are correct. i really need yours help to solve this problem. thank you for all suggestion. yours respectfully - Tomas

A 554 error commonly means that you need to set up authentication in your account properties. On the Outgoing Server tab, "My outgoing server requires authentication" and check the box below to use the same credentials.

it is strange, becose after configuring outlook i run "test account" and it finishing without errors. And user can send emails from inside lan to external and internal mailboxes, but he dont have possibility to send emails from outside company lan.i checked "My outgoing server requires authentication" but didnt help.any more ideas?

Go to Tools -> Account Settings. Select the account that you are sending the messege from, then click on change. On the dialog box that opens up there is a button that says "more settings". Click on that and on the Outgoing Server tab, select "my server requires authentication" and select the "use same settings as incomming mail server". Give that a try.