This question was posted on the KDE forum a few days ago and deserves an answer.

Yes, KMail is maintained, It even has a new maintainer since a few months. Laurent Montel now takes care of KMail2 and already made an awesome work.

So, what’s the state of KMail in KDE 4.7 ?

Since the 4.7.0 tag, 556 commits were made in kdepim/kmail.

But KMail is no longer a monolithic block, so let’s add:

207 commits in kdepim/mailcommon,

51 commits in kdepim/mailfilteragent.

98 commits in kdepim/messagecomposer,

43 commits in kdepim/messagecore,

54 commits in kdepim/messagelist,

153 commits in kdepim/messageviewer,

Still not convinced ? Let’s head to the KDE Bugs Tracker…

Since the creation of the KMail2 product, 690 bugs were marked as RESOLVED.

Amongst those:

11 bugs were marked as UPSTREAM (bug in one of the KDEPIM/KDE dependencies)

were marked as (bug in one of the KDEPIM/KDE dependencies) 4 bugs were marked as DOWNSTREAM (distribution/packaging bug)

were marked as (distribution/packaging bug) 6 bugs were marked as WONTFIX

were marked as 67 bugs were marked as INVALID

were marked as 77 bugs were marked as WORKSFORME (the reporter cannot reproduce the issue)

were marked as (the reporter cannot reproduce the issue) 178 bugs were marked as DUPLICATE (!!)

were marked as (!!) 324 bugs were marked as FIXED

Still according to our bugs tracker,

14 bugs were explicitly marked as fixed in 4.7.2

were explicitly marked as fixed in 24 bugs were explicitly marked as fixed in 4.7.3

were explicitly marked as fixed in 24 bugs were explicitly marked as fixed in 4.7.4

were explicitly marked as fixed in 15 bugs were explicitly marked as fixed in 4.8

KMail bugs closed since KDE 4.7.3 (only the reports explicitly marked as fixed-in 4.7.4 are listed):

143059 printing of mails ignores if part of the mail is blinded out

258117 Cannot create Mailing List filter via context menu

259422 Kmail ignores trash folder setting. It moves deleted emails to the local trash folder.

263587 BCC addresses shows bcc’s to “To:” recipient

278060 Mailing list detection does not work

280649 Kontact crash when closing

282652 Setting up filters for Distribution lists does not work

284789 Does not remember mail transport

285134 Closing the drop action popup by clicking somewhere else will execute a “move” operation instead of “cancel”

285508 subject line is always spell checked with default dictionary

285623 emails are not sent until restart of mail dispatcher agent

285653 Thousands of errors “Select Failed, server replied A000… NO Mailbox …

285814 Shortcut for moving mail to folder does not move to folder highlighted in dialog

285878 search mail – unusable sort by date

286505 kmail no more send mails

286615 Encrypted email not decrypted in-time for printing

286663 Kontact crashed when canceling creation of sieve script

286827 Unable to reply to an encapsulated message

286875 Redirected email is stored in wrong sent-folder

286889 Move Thread to Trash Context Menu

286922 edited mail from outbox deleted after closing

287367 Kmail is truncating recipients in “reply to all”

287696 redirected mail isn’t marked as redirected (or forwarded)

287779 Copy Email then Paste As Attachment does not work as expected