TB download every mail, whenever it checks for new mail, even if it has been downloaded before.

I now have about 14 copies of each mail, seems like it does not recognize that it has already downloaded.

Hi, well, POP3 is not designed to keep the emails in the Inbox on the server permanently. Because when checking for new messages, to my knowledge he needs to go through all the mails in the Inbox on the server to check if it is already downloaded or not.

To this end, there is a cache on the client side. The size of this cache can be configured in the following manner through prefs.js:

user_pref ("mail.server.server1.numHdrsToKeep", 10000);

I don't know the default value, but you can set it for example 10000 (cache to 10000 mails). You must check in your server folder to which it is (server1, Server2, etc) according to the other entries in the config file.

However, you should not keep mails to "Infinity", I do not know the maximum value possible for this and I guess that we slow down the download of new messages with the increase in number of mails.

I have to admit, I also use the above setting to increase the memory cache my caches POP3 to have emails available on my PC, as well as on my smartphone email client. However, what I did to not blow: in my mail provider (GMX) web-based configuration, I specify that emails are automatically deleted from my Inbox on the server after 3 months. This constantly maintains the number of mails away from 10000...

Tags: Thunderbird

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