On Thu, Jan 22, 2026 at 08:17:56AM -0700, [email protected] wrote: > Hi, > > Most messages with attachments are displayed in RoundCube Webmail with > an openable menu presenting options Open and Download for each > attachment.
Attachments are just one special case of MIME multipart messages. Another would be "alternatives" -- just (in some way) the same stuff presented in different ways, say as plain text and as HTML (to stay with your example). That could also be PDF, Libre Office Writer... you name it. In the alternatives case, your mail user agent chooses whatever is most "convenient" (something you can often configure). See the MIME description here [1] for the whole kaboodle. My guess is that those offered for download are "attachments" (i.e. have the "Content-Disposition: attachment" in MIME parlance, whereas those being shown have "Content-Disposition: inline" and are (one of) several alternatives. Does your mail client have a way to show you the mail "as is"? Cheers -- tomás
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