qpsmtpd VS ImapSync

I used a proxy like this for a few years, though in my case it was to handle spam.

I based my work on :

http://smtpd.github.io/qpsmtpd/

I'd reject spam at SMTP time, but also capture the bodies of all messages that were rejected so that users could view them in an online quarantine. Worked pretty well, though I think these days the original perl-based project has been reworked into a nodejs thing:

https://haraka.github.io/about/

I use qmail with qpsmtpd as a custom SMTP front end, I don't play with it now but I used to try different techniques and keep stats on what worked and what didn't (eg greylisting, blocklists, advertise AUTH LOGIN with a 250 header and ban anyone who actually tries to use it) and then I have my own custom forwarding and routing of dynamic usernames etc.

You see this https://imapsync.lamiral.info/ ? It's only for mails but it's a great solution.

I've had to do large email migrations before and honestly, imapsync is the way to go - https://github.com/imapsync/imapsync

Do your parents have a domain, or are they just using the provider's domain? I've set up my 1522+ to backup our mail accounts using MailPlus on the Synology, and IMAPSYC running on my lab server. But it's backup only, not archiving. That technology could be used to get to your desired state, but there's some work involved to make a secure connection from the internet to your Synology possible, sync/archive the mail, configure you parent's devices to find your device, etc.

Check out imapsync (https://imapsync.lamiral.info/) - I am using it since years and migrated tousands of mailboxes without any problems.

Check https://github.com/imapsync/imapsync

I would use https://imapsync.lamiral.info/ for email and sure there is another tool for contacts and calenders.

There are two solutions for this 1. Using a tool called imap-sync to sync all your emails (it has a great incremental sync). You can run it periodically via cron 2. Using the same or similar tool and export to a database.

If you want to sync from one IMAP server directly to another, there's also the very popular imapsync: https://github.com/imapsync/imapsync

Have a look at imapsync. Source: former web hosting sysadmin. Used this many times to move email.