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migrate imap emails from courier to dovecot



i'm just in a the process  of migrating a froxlor managed couriermail server to a new froxlor/debian9/postfix/dovecot mail server

there are hundreds of gigabyte imapmap emails with hundreds of accounts.

to make this a bit less painfully to move

i started to created a small email migration script for the beginning




emails passwords must be plain

latest docker

remote access to the server


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i use postgrey and   SpamAssassin with  postfix

my notes may give you the hint:








1) Create a bash script to receive e-mail from Postfix and pipe it to SpamAssassin for rewriting. Then forward the rewritten version to Postfix's sendmail implementation:

# spamfilter.sh
# Simple filter to plug SpamAssassin into the Postfix MTA
# Modified by Jeremy Morton
# This script should probably live at /usr/bin/spamfilter.sh
# ... and have 'chown root:root' and 'chmod 755' applied to it.
# For use with:
#     Postfix 20010228 or later
#     SpamAssassin 2.42 or later

# Note: Modify the file locations to suit your particular
#       server and installation of SpamAssassin.
# File locations:

logger <<<"Spam filter piping to SpamAssassin, then to: $SENDMAIL $@"

exit $?

2) Ensure the newly-created /usr/bin/spamfilter.sh has correct permissions (0755), and is owned by root:root.

3) Modify the /etc/postfix/master.cf file; first, change the first 'smtp' line of the file to:

smtp      inet  n       -       -       -       -       smtpd -o content_filter=spamfilter

Then, add the following (a call to our newly-created spamfilter script) at the end:

          unix  -       n       n       -       -       pipe
   flags=Rq user=spamd argv=/usr/bin/spamfilter.sh -oi -f ${sender} ${recipient}


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You can utilize a variety of techniques to transfer mailboxes from an IMAP server to an Office 365 server. However, I prefer EdbMails IMAP to Office 365 Software, which is specifically intended to function in many domains and allows customers to easily migrate IMAP to Office 365/Exchange server. 

The application is compatible with all IMAP email servers, including Google Mail - Gmail, Outlook.com, Office365.com, Yahoo Mail, Yahoo Mail Plus, Yahoo Mail UK, Yahoo Mail, and others. It may be used by both technical and non-technical users. The program is well-designed, with some wonderful capabilities that allow you to transfer all of your IMAP emails to Office365 with ease compared to other competitors.

Know more: EdbMails IMAP migration tool

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