Windows 7 Ultimate Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.1.0 Protocols: POP3 and SMTP For E-mail: "To save disk space, do not download:" "Messages larger than" set to 75 KB For messages greater than 75 KB because of large attachments (photos), I get > Truncated! > >This message exceeded the Maximum Message Size set in Account Settings, so >we have only downloaded the first few lines from the mail server. > > Download the rest of the message. with the last line resembling a link. When I try to download the rest of the message by selecting that last line, nothing happens. Thunderbird Notes for 52.1.0 indicates this is a problem with IMAP, but I see it with SMTP/POP3. Although this would thus appear to be a known problem, I could not find another bug report on it. I see this problem in Safe Mode, even after setting browser.cache.memory.capacity = 200000 browser.cache.memory.max_entry_size = -1

Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.0.1 I reverted back to Thunderbird 52.0.1 and determined that this is not a problem with that version. Thus, this is a new problem in 52.1.0. Since there is no workaround within Thunderbird, this is a Major bug. The only workaround is to use a browser to access the E-mail server, and that works only if the user's E-mail host allows Webmail access.

Yes, you're right, we regressed this in TB 52.1. It will be fixed in TB 52.2 again and it's already fixed in TB 55 Daily.

One option is of course to always download the entire message.