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This article describes the major changes in Thunderbird version 45.0 released in April 2016.

This article describes the major changes that are visible to users in Thunderbird version 45.0. Full details of all the changes can be found in the Thunderbird 45 [https://www.mozilla.org/en-US/thunderbird/45.0/releasenotes/ release notes]. __TOC__ =Mail Composition= Various improvements have been made to mail composition. * The sender name (From) can now be [https://bugzilla.mozilla.org/show_bug.cgi?id=87987 edited per message] to allow for one-off adjustments. ;[[Image:editable from address]] * When using more than one spell check dictionary, the dictionary can now be selected while entering the message subject. There is also a [https://bugzilla.mozilla.org/show_bug.cgi?id=368915 language indicator] showing the selected dictionary. ;[[Image:dictionary TB45]] * The font size selection has changed, there is now a [https://bugzilla.mozilla.org/show_bug.cgi?id=769604 button for size selection] on the editing toolbar and the "Smaller/Larger font size" buttons now change the size to the next available font discrete size. ;[[Image:font size TB45]] * The Thunderbird composition window now functions more like a word processor in that pressing the "Enter" key inserts a new paragraph, pressing "Shift+Enter" inserts a new line. This new behavior can be switched off in the {menu {for mac}Thunderbird > Preferences{/for}{for win}Tools > Options{/for}{for linux}Edit > Preferences{/for} > Composition > General} tab. * Fonts used in a received message that are not locally installed will now be shown in the font indicator. ;[[Image:Font indicator TB45]] =Mail Delivery Format= * Previously, Thunderbird sent mail as plain text if no "rich text" elements were used in the message and the recipient wasn't marked as preferring HTML email in the address book. This automatic "downgrade" can now be disabled in the {menu {for mac}Thunderbird > Preferences{/for}{for win}Tools > Options{/for}{for linux}Edit > Preferences{/for} > Composition > General tab > Send Options…} dialog. =Chinese, Japanese and Korean mail= * When sending email which was composed using Chinese, Japanese or Korean characters, unwanted extra spaces were inserted within the text. This has been corrected and mail will be sent and received exactly as it was composed. * Japanese mail now fully complies with RFC 1468 and RFC 3676. =Remote Content Exceptions= * By default, Thunderbird does not display images embedded in HTML messages that are not sent with the message but need to be loaded from a website. This protects the users against tracking. The menu to select sites for which remote content will be loaded has been improved. ;[[Image:remote exceptions TB45]] * Embedded images will now also be displayed [https://bugzilla.mozilla.org/show_bug.cgi?id=1251408 in replies or forwarded messages] if they were displayed in the original message. (Note: Due to internal changes, remote content exceptions based on the sender's email address are not migrated from Thunderbird 38.) =Address Book Export= * The address book can now be [https://bugzilla.mozilla.org/show_bug.cgi?id=117236 exported as UTF-8]. ;[[Image:Address book export TB45]] * [https://bugzilla.mozilla.org/show_bug.cgi?id=1246703 All address books] can now be exported at the same time. =Message List and Message Header= * The headings in the message pane now show a [https://bugzilla.mozilla.org/show_bug.cgi?id=36489 "Correspondents" column] by default instead of the "From" and "Recipient" columns. Existing folders will be upgraded to the new column, unless this upgrade is [https://bugzilla.mozilla.org/show_bug.cgi?id=1152706 switched off]. ;[[Image:correspondents TB45]] * When viewing a message, the name and email address of sender or recipient can now be copied from the message header using a [https://bugzilla.mozilla.org/show_bug.cgi?id=232021 new option] in the context menu. ;[[Image:copy name and email TB45]]