Ruby script to migrate emails between imap mail servers14.11.14

1.
install ruby 
apt-get install ruby

2.
save the below script to a file like:
imapsync.rb

3.
change the source and destination setting in the script

4.
execute it with:
ruby imapsync.rb

#!/usr/bin/env ruby
require 'net/imap'

# Source server connection info.
SOURCE_NAME = 'username@example.com'
SOURCE_HOST = 'mail.example.com'
SOURCE_PORT = 143
SOURCE_SSL  = false
SOURCE_USER = 'username'
SOURCE_PASS = 'password'

# Destination server connection info.
DEST_NAME = 'username@gmail.com'
DEST_HOST = 'imap.gmail.com'
DEST_PORT = 993
DEST_SSL  = true
DEST_USER = 'username@gmail.com'
DEST_PASS = 'password'

# Mapping of source folders to destination folders. The key is the name of the
# folder on the source server, the value is the name on the destination server.
# Any folder not specified here will be ignored. If a destination folder does
# not exist, it will be created.
FOLDERS = {
  'INBOX' => 'INBOX',
  'sourcefolder' => 'gmailfolder'
}

# Maximum number of messages to select at once.
UID_BLOCK_SIZE = 1024

# Utility methods.
def dd(message)
   puts "[#{DEST_NAME}] #{message}"
end

def ds(message)
   puts "[#{SOURCE_NAME}] #{message}"
end

def uid_fetch_block(server, uids, *args)
  pos = 0

while pos < uids.size
    server.uid_fetch(uids[pos, UID_BLOCK_SIZE], *args).each {|data| yield data }
    pos += UID_BLOCK_SIZE
  end
end

@failures = 0
@existing = 0
@synced   = 0

# Connect and log into both servers.
ds 'Connecting...'
source = Net::IMAP.new(SOURCE_HOST, SOURCE_PORT, SOURCE_SSL)

ds 'Logging in...'
source.login(SOURCE_USER, SOURCE_PASS)

dd 'Connecting...'
dest = Net::IMAP.new(DEST_HOST, DEST_PORT, DEST_SSL)

dd 'Logging in...'
dest.login(DEST_USER, DEST_PASS)

# Loop through folders and copy messages.
FOLDERS.each do |source_folder, dest_folder|
  # Open source folder in read-only mode.
  begin
    ds "Selecting folder '#{source_folder}'..."
    source.examine(source_folder)
  rescue => e
    ds "Error: select failed: #{e}"
    next
  end

# Open (or create) destination folder in read-write mode.
  begin
    dd "Selecting folder '#{dest_folder}'..."
    dest.select(dest_folder)
  rescue => e
    begin
      dd "Folder not found; creating..."
      dest.create(dest_folder)
      dest.select(dest_folder)
    rescue => ee
      dd "Error: could not create folder: #{e}"
      next
    end
  end

# Build a lookup hash of all message ids present in the destination folder.
  dest_info = {}

dd 'Analyzing existing messages...'
  uids = dest.uid_search(['ALL'])

if uids.length > 0
    uid_fetch_block(dest, uids, ['ENVELOPE']) do |data|
      dest_info[data.attr['ENVELOPE'].message_id] = true
    end
  end

dd "Found #{uids.length} messages"

# Loop through all messages in the source folder.
  uids = source.uid_search(['ALL'])

ds "Found #{uids.length} messages"

if uids.length > 0
    uid_fetch_block(source, uids, ['ENVELOPE']) do |data|
      mid = data.attr['ENVELOPE'].message_id

# If this message is already in the destination folder, skip it.
      if dest_info[mid]
        @existing += 1
        next
      end

# Download the full message body from the source folder.
      ds "Downloading message #{mid}..."
      msg = source.uid_fetch(data.attr['UID'], ['RFC822', 'FLAGS',
          'INTERNALDATE']).first

# Append the message to the destination folder, preserving flags and
      # internal timestamp.
      dd "Storing message #{mid}..."

tries = 0

begin
        tries += 1
        dest.append(dest_folder, msg.attr['RFC822'], msg.attr['FLAGS'],
            msg.attr['INTERNALDATE'])

@synced += 1
      rescue Net::IMAP::NoResponseError => ex
        if tries < 10
          dd "Error: #{ex.message}. Retrying..."
          sleep 1 * tries
          retry
        else
          @failures += 1
          dd "Error: #{ex.message}. Tried and failed #{tries} times; giving up on this message."
        end
      end
    end
  end

source.close
  dest.close
end

puts "Finished. Message counts: #{@existing} untouched, #{@synced} transferred, #{@failures} failures."

http://wonko.com/post/ruby_script_to_sync_email_from_any_imap_server_to_gmail

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Ruby script to migrate emails between imap mail servers14.11.14

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