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Thunderbird is marking unread messages as read

Thunderbird Customization
info14297
info14297

Thunderbird is marking unread messages as read after about 5 minutes. I've tried changing settings by delaying or unticking automatically mark messages as read in the "reading & display area" and it's still marking messages after about 5 minutes to read when they haven't been opened. We are not using Bitdefender - I saw this was referred to in the help section and changes could be made to that to stop this happening but we are only using Microsoft defender. We are not using another device, ie phone or ipad to access emails on this account - just a PC We do have other email accounts running on different PC and none of those appear affected by this problem.

Thunderbird is marking unread messages as read after about 5 minutes. I've tried changing settings by delaying or unticking automatically mark messages as read in the "reading & display area" and it's still marking messages after about 5 minutes to read when they haven't been opened. We are not using Bitdefender - I saw this was referred to in the help section and changes could be made to that to stop this happening but we are only using Microsoft defender. We are not using another device, ie phone or ipad to access emails on this account - just a PC We do have other email accounts running on different PC and none of those appear affected by this problem.

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