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I have been using Mozilla Thunderbird to manage my mail, I also set this program to download and save all mail + attachments to my harddrive.
However I have realised a big security issue as when I ran a virus scan recently, My Thunderbird mail directory had around 100 different types of trojans, ransomware, viruses. Some of these appear to be from mail years ago in my inbox.
When manually browsing my mail through a web browser I would never download a .exe type attachments as I am aware of the risk, How can I tell thunderbird to only download .txt, .png, .jpg attachments and ignore the rest.
I wouldn't do this: the extension type is no guarantee of the content, nor that some buffer overflow exploit won't be discovered in the future with the file types you specify. You are better to make sure that your virus scanner checks all e-mails as they arrive, and quarantines any with a virus. Some other extensions, such as ZIP, DOC/DOCX or PDF, may well contain data that you'll want to receive. Also, a good virus scanner will check links in an e-mail, and flag any that take you to suspect sites. – AFH – 2015-05-02T13:29:18.577