Dear all,
I’ve been using an email account for mobile use only which I added a long time ago to K9mail as a POP3 account. I’m now moving to a new phone and would like to move all my old messages, including those I sent, from my old to my new phone. Is there any way to do this, preferably without using a cloud service?
Thanks in advance for any help.
Short answer: No.
Long answer: If you are willing to invest lots of time, you might have a slim chance. It’s been discussed in the past, so use the forum’s search function.
(gist: POP3–>IMAP by hand; alternative: ADB commands and lots of luck (no encryption, older Android version, …))
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Thanks for the answer. Given the short lifespan of mobile phones, are there any plans to implement this in the future, especially when K9mail is becoming Thunderbird for Android? If not (which to me will be a showstopper for any future use of K9mail/Thunderbird for Android!), Is there any way to at least create archives in a widely used format (e.g. the mbox format used by Thunderbird) that can be copied to a computer?
More likely that pop3 functionality will be removed from the app.
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Why not simply use IMAP instead of the outdated Pop3? That way any + all devices can contain your emails.
I keep most of them on my PC with Thunderbird and only use K-9 for when I’m not at the PC. Much simpler than Pop3 used to be imho 
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I cannot change the past, and when I started using K9mail my server and K9mail clearly did not always talk the same language which caused me to lose a fair amount of messages.
Even when using IMAP it should - IMHO - be possible to migrate K9mail from one phone to another, for instance to migrate messages that are no longer on the server for instance for server space reasons. And as I said in another message, I cannot change the past and am stuck with my old POP3 account.