You are asking for something that isn't supported in the POP protocol and so is out of the control of the POP client (K-9 or any other).
The POP protocol supports *retrieving* mail from the server. There is no facility for syncing a client's inbox back to the server. You may want to look at the wikipedia entry for POP, which includes a discussion of the differences between POP and IMAP. <https://en.wikipedia.org/wiki/Post_Office_Protocol> If you are in doubt about what a POP server supports (therefore what you can ask of a POP client) try reading the RFC (protocol standards documentation): <https://tools.ietf.org/html/rfc1939> If you want the ability to move messages from a client back to the server (so a different client has access to them) you need to use IMAP. The POP protocol simply doesn't support what you want to do. I see that cketti has already responded to your feature request, saying basically what I say above. > Date: Sunday, January 31, 2016 09:38:12 -0800 > From: wroot <[email protected]> > > I have a rather similar request. I want to be able to move > messages from Sent to Inbox (to download them into my desktop > client later) > https://groups.google.com/forum/#!topic/k-9-mail/fRyQVFT9byk Have > submitted a feature request > https://github.com/k9mail/k-9/issues/1055 > > On Friday, October 23, 2015 at 1:53:10 AM UTC+3, Thomas Boardman > wrote: >> >> I'm using k9 mail on Android with a POP3 service. When I >> accidentally move a message from inbox to trash, I can't move it >> back to inbox. All other POP3 email clients I have used allow >> this. >> >> It should be easy because trash is all right there on the phone. >> The message exists. I can see it. But k9 does not allow me to >> move it. >> >> This is a k9 issue. There is nothing in the design of Android or >> the design of POP3 protocol that prevents moving a message from >> trash to inbox. As I said before, I've used many POP3 clients >> and they all allowed this. >> >> Moving the message does not require any action on the server. The >> message exists on the phones local storage. All we need to do is >> move it from one location in local storage (trash folder) to >> another location in local storage (inbox). >> >> I have seen other users ask about this, but I have not seen any >> good answer. >> >> Does that ability exist within K9 and I'm not finding it? Or is >> this feature just missing? >> >> Thanks in advance for any response. >> -- -- You received this message because you are subscribed to the K-9 Mail Users List. To post to this group, send email to [email protected] To unsubscribe, email [email protected] To report an issue with K-9 Mail, visit http://code.google.com/p/k9mail/issues/list For more options, visit this group at http://groups.google.com/group/k-9-mail --- You received this message because you are subscribed to the Google Groups "K-9 Mail" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
