Backup Gmail with getmail
We can use getmail to fully backup email messages from a Gmail account.
Emails will be backed-up in Maildir format, meaning that each email will be a separate text file, readable with any email client, or even with a text editor.
pacman -S getmail
Creating required files and folders
Getmail reads its configuration from ~/.getmail/getmailrc by default. Unfortunately this directory and file do not exist by default, so we need to create them.
mkdir ~/.getmail touch ~/.getmail/getmailrc chmod 700 ~/.getmail
We also need to create the folder where the emails will be backed-up:
mkdir ~/bak/mail cd ~/bak/mail mkdir cur new tmp
For this example ~/bak/mail was chosen , but it could just as well be ~/mail. The cur, new and tmp folders are required by the Maildir format and by getmail.
Open the ~/.getmail/getmailrc file and add the entries below. The complete file can also be found here http://archlinux.pastebin.com/0GH5vtSn
# More configuration options here: # http://pyropus.ca/software/getmail/configuration.html
[retriever] type = SimpleIMAPSSLRetriever server = imap.gmail.com mailboxes = ("[Gmail]/All Mail",) username = USER password = PASS
The retriever section tells getmail where to connect. It uses IMAP to connect to the server. For POP3 we can use the type SimplePOP3SSLRetriever, but we'll also have to modify the server field. The mailbox which we backup will be All Mail.
The username and password fields need to be changed to your own.
[destination] type = Maildir path = ~/bak/mail/
The path field is the destination folder (which we created earlier) where the emails will be backed-up. All emails will be placed in 'new', and the cur and tmp folders will be left empty. This is normal, do not delete cur and tmp.
The options section is a bit longer:
[options] verbose = 2 message_log = ~/.getmail/log
This tells getmail to be very verbose and tell us the status of each message (whether it was backed-up successfully, total number of messages, etc). Also, everything will be logged to ~/.getmail/log.
# retrieve only new messages # if set to true it will re-download ALL messages every time! read_all = false
# do not alter messages delivered_to = false received = false
Setting delivered_to and received fields to false will prevent emails from being altered by getmail.
Running getmail and adding a cron job
Now if we run getmail it will backup all Gmail emails to ~/bak/mail, outputting its status along the way.
We want to periodically run getmail to backup our Gmail account, so we'll add a cron job:
* * * * * ID=getmail FREQ=1d getmail -q
The -q parameter will run getmail in quiet mode and only report errors.
Migrating emails, importing old emails
Backing-up emails will suffice for most people, but if we want to migrate our emails to another account it gets a bit tricky. The appendmail script from http://bitbucket.org/wooptoo/appendmail can help us import emails to another account, be it Gmail or not. It can also be used to import old emails in our existing Gmail account.
Basically it reads every email file from its 'import' folder and puts it on Gmail.
A direct link to download is http://bitbucket.org/wooptoo/appendmail/get/tip.zip It needs PHP to run, and you need to modify the username and password to yours.