You can remap IMAP source folder to destination folder. It’s very likely that sent folder needs to be remapped between different hosts. I suggest you to use the dry-run option and examine the log to see if the folders are correctly mapped.

More in detail, I created an user just to run imapsync as a good practice in Linux. Then downloaded imapsync in a subfolder of the user home directory, created two very simple scripts, one with the imapsync command with all the parameters I needed and one for the token. Lastly, using crontab -e, I added two entry one for each script.

You don’t need to put imapsync into etc, it is not a binary and, as far as I know, there is no package that you can install with a package manager, it’s just a script that you download and execute. Anyway, where you put that, its up to you.

Imapsync is a (PERL?) script you download, and then run it passing parameters.

If you need OAuth, and it seems so since you want to sync a Google account, you have to download some more files that help you obtain an access token for Gmail.

But as far as I remember, there are no config files needed to run it. Infact I am cron running it every 5 minutes to one way sync an IMAP account to Office365 (needs an OAuth token too, and a second script to refresh the token every hour)

Feel free to ask for more, but I cannot guarantee a timely response.

A sad news. Condolences to his family. May his legacy continue to inspire others as he did.

I come from VyOS and really liked it, but still prefer opnsense for the GUI, constant updates and plugins. VyOS started losing appeal once they opted for subscription stable iso access (even if they did give me a free subscription for some comment contribution in their repo). Also, I have to admit, that VyOS needs a fraction of the resources needed by opnsense.

I am not saying your server is not secure, but just fencing off IMAP from the web is not enough to limit spammers from relaying mail through your server. They usually exploit a misconfigured SMTP server, which does run on port 25 (plain or start TLS mode)

You can also evaluate to buy something like this for 3.5 or 2.5inch disks.