System administration command. Retrieve mail from mail servers and forward it to the local mail delivery system. fetchmail retrieves mail from servers that support the common mail protocols POP2, POP3, IMAP2bis, and IMAP4. Messages are delivered via SMTP through port 25 on the local host and through your system’s mail delivery agent (such as sendmail), where they can be read through the user’s mail client. fetchmail settings are stored in the ~/.fetchmailrc file. Parameters and servers can also be set on the command line, which will override settings in the .fetchmailrc file. fetchmail is compatible with the popclient program, and users can use both without having to adjust file settings.
Retrieve all messages from server, even ones that have already been seen but are left on the server. The default is to retrieve only new messages.
Specify an authentication type. type can be: password, kerberos_v5, kerberos, gssapi, cram-md5, otp, ntlm, ssh, or any. When using the default value, any, fetchmail will use the highest authentication available. In decreasing order of security: gssapi, kerberos, cram, x-otp, ntlm, then login. Using ssh suppresses authentication. Use ssh when using an end-to-end secure connection.
Set the maximum number of messages (n) accepted from a server per query.
Set the maximum number of messages sent to an SMTP listener per connection. When ...