1. Log into LTSG webmail by going to the following website: http://webmail.ltsg.edu
2. Enter your full email address and password.
3. In the Menu bar select Settings and then "Auto Responder" from the drop down list.
4. Enter your out of office message in the top text box.
5. Set Status to "Respond Once". This will only tell people the first time they send you a message that you are out of the office.
6. Set the box next to Status to "0".
7. Enter the dates in the format given in the "Reply only between dates:" field to prevent the message from being sent after you return or before you leave.
8. Check the "Reply if only to me box." This will help prevent responses going back to mailing lists that you may be on.
9. Press the "Save Changes" button to save you information and set up the auto responder.
10. At anytime you can cancel this auto responder by changing the Status to "No Responder."

Due to storage constraints email is automatically deleted from the server after 90 days.  It is recommended that you use an email client such as outlook if you wish to download and retain your email for longer than that 90 day period.

There are two things to check. 

First make sure that you have configured you email client to authenticate when sending mail. This is normally in the advanced setting of the account setup.   The login and password is the same as your email account. 

If this does not resolve the issue your ISP may be blocking traffic on port 25.  Try changing your SMTP port to 3325 from the default value of 25.