At the moment I am running neo-mutt on Debian 9. Once or twice a day I receive a HTML message, typically with a PDF file as an attachment. Picking out and viewing the links and attachments always is a hassle, and sometimes is rather difficult.
Rather than hassle with mutt, I hoped to install an auxiliary mail client with GUI (such as Thunderbird) with which I could open such messages, view the links, and print the attachments. But Thunderbird is demanding the URLs of POP and SMPT servers, and I do not wish to allow Thunderbird to mess around with my mail, other than viewing specific messages. One approach would be to get a mail account strictly for this purpose, and set up a complete Thunderbird mail system using that account. But is there a better solution? RLH