I've got a scenario where I need to retain a backup of an IMAP email account in Thunderbird when it even has email deleted from it on the server. In other words, I just always want it to keep accumulating all email forever and if I delete it from another mail client, it should just remain in this one in Thunderbird.
It seems like there should be a setting somewhere in the advanced "about:config" area having to do with
expunge or something similar that would allow local deletion policy to be disabled, but I've had no luck finding it so far.
I also thought perhaps there might be some setting like "Do not delete any messages" under the
Server Settings for the IMAP account or perhaps in its
Advanced... button settings dialogue, but there's no such option that I can find.
Any idea on how to accomplish this?
Just to clarify the context of this situation: Dealing with a friend who's recently had a loved one who had a stroke which has affected many aspects of their ability to reason/recall, but unfortunately they still give the appearance of being able to function somewhat normally and have reasonably good long term recall. This has lead to their accidentally and repeatedly deleting all of their email history for the past 25 years. This is very bad and the individual themselves doing this action on their shared family email is also upset (each time it has happened) about doing this.
The goal is to create an easy access client email reader backup that the other family members can still use and retain a copy of everything conveniently even in the face of incessant inadvertent deletion by their loved one.
Currently the restorative process with the host is becoming quite costly since the host has a fee each time for the restoration process. They also only serve IMAP (they apparently phased out POP3 service several years ago).
The companion who primarily uses the email is also elderly and needs a very, very simple client option - Thunderbird is the best I could think of, but I could get them to spring for Outlook too probably, they're just being "nickeled and dimed" to death presently with the situation.