To access the lotus notes outgoing mailbox
- open the databases do a File->Database->Open or CTRL+O
- Select server “Local” or “On My Computer”
- In field “File Name:” type in mail.box or smtp.box in the filename (mail is for regular lotus notes mail, smtp is if you use pop)
- Click OK
CAREFUL: Do not delete mail.box on a Server !
Source: Notes Ninja