On the "Servers" tab of account settings, the authentication scheme can be adjusted. The "Authentication" drop-down for incoming servers is set to "Auto" by default and will show the current authentication method (i.e. "Auto (AUTO LOGIN)") being used by the account. "Auto" attempts to use the most secure authentication method available first and if it fails, tries the nTo begin, you will need to set up a new account or import account settings from another application. Go to Tools > Mail and chat accounts. If you have not yet created any accounts, you will be prompted to create an account now. If you have already created an account, click the Add button. Select which kind of account you would like to create.
Ask your ISP for the specific server names or IP addresses to enter into the incoming and outgoing mail servers. If your ISP uses a non-standard server port (default ports are 143 for IMAP, 110 for POP, and 119 for NNTP), you can enter it after the server name in the form "servername:port", i.e. "pop.example.com:111".ext most secure method until one succeeds. These authentication settings only control encryption of your username and password. TLS or SSL is needed to encrypt all your mail data, while it is being transferred between Opera and your mail server.
If you do not want to use "Auto" authentication or have problems making it work with your account, simply use the drop-down to specify the type of authentication to use. Not all servers support all methods of authentication.
If your account requires authentication for sending e-mails, change "Authentication" for your "Outgoing server" to "Auto" and enter your username and password.
Opera supports:
CRAM-MD5, APOP, login, and plaintext authentication for POP accounts
CRAM-MD5 and plaintext authentication for IMAP and NNTP accounts
CRAM-MD5, login, and plaintext authentication for SMTP accounts.
