To set this up, you need to install pdftotext. This application is available in either poppler-utils or xpdf-utils - most people seem to use the latter, but I suspect the former is probably a better option for a text-only server. I installed poppler-utils.

Next create (or edit) the ~/.mailcap file, so that it has the following line:

application/pdf;                pdftotext -layout %s -; copiousoutput

You could also add the line:

text/html;                      elinks %s; nametemplate=%s.html`

The latter line opens HTML attachments in elinks.

Then just hit “V” when viewing an email, and you will see the attachments, select the attachment and hit Enter to view it. Awesome :)

My folder layout is that I have a Spam folder, within which I have two folders - Spam/Ham and Spam/Verified. The Spam/Ham are good emails, particularly those that have been wrongly identified as Spam. The Spam/Verified are the Spam that I am confirming are definitely Spam. SpamAssassin places all the detected Spam in the Spam folder. I generally move all the Spam folder into Spam/Verified except the one or two false positives, which I move to Spam/Ham. Then overnight SpamAssassin learns from those two folders - a fairly standard SpamAssassin layout I think.

Occasionally we get Spam in our Inbox, and obviously these can be moved straight to the Spam/Verified folder.

The important factor here is that I want to be able to easily flag individual emails in my Inbox as Spam, but I also want to be able to tag the whole of my Spam folder and flag as Spam.

The manual gives a list of functions, which I used rather than the normal key bindings, as the manual advises that this is more portable and robust. I used the tag-prefix command to enable tagging. I was not using the keys H nor S, so I chose these as Ham and Spam respectively.

You need two macros for each function - one for use in the folder list (index) and one for use inside an email message (pager), so that you can flag it as Spam without moving back to the message list.

The biggest problem I encountered was the difficulty that removing the unread flag resulted in the selection moving down to the next email, and then the next email would be flagged as Spam - frustrating. The only solution seemed to be modify the muttrc configuration before and after, and almost unbelievably that is in fact possible using the function.

The final macros are shown below:

# Move message(s) to Spam/Verified by pressing "S"
macro index S "<tag-prefix><enter-command>unset resolve<enter><tag-prefix><clear-flag>N<tag-prefix><enter-command>set resolve<enter><tag-prefix><save-message>=INBOX/Spam/Verified<enter>" "file as Spam"
macro pager S "<save-message>=INBOX/Spam/Verified<enter>" "file as Spam"
# Move message(s) to Spam/Ham by pressing "H"
macro index H "<tag-prefix><enter-command>unset resolve<enter><tag-prefix><clear-flag>N<tag-prefix><enter-command>set resolve<enter><tag-prefix><save-message>=INBOX/Spam/Ham<enter>" "file as Ham"
macro pager H "<save-message>=INBOX/Spam/Ham<enter>" "file as Ham"
# Return to Inbox by pressing "."
macro index . "<change-folder>=INBOX<enter>" "Inbox"

Suddenly Mutt is the easiest way for me to handle by Spam.