It doesn't look like they are logging in, just attempting to. It's common to see login attempts with imap as well as pop3 and ftp. You only really need to take action if someone is persistently trying to login. Of course it is still wise to only give certain usernames and/or ips the authority to log in.
Edit Log:
- Post edited by Hargreaves Post edited by Hargreaves (User) on Oct 20, 2005, 9:31 AM