Thunderbird hangs on send saying "attaching"

[pete_bannister]

PLEASE fix this -

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Sorry didn't realize that! Found the official bug tracking ticket:
https://bugzilla.mozilla.org/show_bug.cgi?id=532395

Looks like this should be fixed in TB 53.

Also mentioned in a comment on that ticket:

Fixed by changing the handling of embedded images in an access-restricted bug. Some details in the bugs depending on meta-bug 1322155. This work will ship with TB 52 ESR in March 2017.

Users can try this in an Earlybird version TB 52a2 after Dec. 5th, 2016. Earlybird 52a2 is still not available at https://www.mozilla.org/en-US/thunderbird/channel/ but can be downloaded from here:
http://ftp.mozilla.org/pub/thunderbird/ ... mm-aurora/ or localised from
http://ftp.mozilla.org/pub/thunderbird/ ... rora-l10n/

This is for expert users only. Remember that Earlybird TB 52a2 is "alpha" software, so your PC might explode

[DaveLaw]

Regarding the comment from our Moderator above:
does anybody have an idea what the relevant Bug ID would be in Bugzilla?
(Bug id=532395 has been permanently closed)
(surely this issue has been reported there?! I can't find a relevant Bug report)