PUBLIC MARKS with tags mail & backup

getmail is a mail retriever designed to allow you to get your mail from one or more mail accounts on various mail servers to your local machine for reading with a minimum of fuss. getmail is designed to be secure, flexible, reliable, and easy-to-use. getmail is designed to replace other mail retrievers such as fetchmail. getmail version 4 includes the following features: * simple to install, configure, and use * retrieve virtually any mail o support for accessing mailboxes with the following protocols: POP3 POP3-over-SSL IMAP4 IMAP4-over-SSL SDPS (Demon UK's extensions to POP3) o support for single-user and domain mailboxes o retrieve mail from an unlimited number of mailboxes and servers o can remember which mail it has already retrieved, and can be set to only download new messages * support for message filtering, classification, and annotation by external programs like spam filters and anti-virus programs * support for delivering messages to different destinations based on the message recipient * reliability o native safe and reliable delivery support for maildirs and mboxrd files, in addition to delivery through arbitrary external message delivery agents (MDAs) o does not destroy information by rewriting mail headers o does not cause mail loops by doing SMTP injection, and therefore does not require that you run an MTA (like qmail or sendmail) on your host * written in Python, and therefore easy to extend or customize o a flexible, extensible architecture so that support for new mail access protocols, message filtering operations, or destination types can be easily added o cross-platform operation; getmail 4 should work on Unix/Linux, Macintosh, and other platforms. Windows support available under the free Cygwin package. * winner of various software awards, including DaveCentral's "Best of Linux"

n this tutorial I will show how you can set up a Postfix mailserver as a backup mail exchanger for a domain so that it accepts mails for this domain in case the primary mail exchanger is down or unreachable, and passes the mails on to the primary MX once that one is up again.