How to disable Thunderbird 72-byte line breaks

SC2 2017-07-22

2024-04-08

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Thunderbird Addon Toggle Word Wrap information is being noted.

add-on: When you install Toggle Word Wrap in Thunderbird, you can turn on / off 72 bytes of line feed.

Toggle Word Wrap Add-on Information
Thunderbird's mail sending specification
　2-1. Screen image when receiving with smartphone
How to use Toggle Word Wrap
　3-1. How to invalidate 72 byte newline permanently

Toggle Word Wrap Add-on

Toggle word wrapping and element wrapping in the message composition and HTML display windows, respectively. Based on original version by Kaspar Brand.

External link

Toggle Word Wrap :: Add-ons for Thunderbird

Thunderbird mail transmission specification

Thunderbird is a specification (default behavior) to send mail by inserting a line feed code every 72 bytes.

This default behavior can be changed using the setting editor.
Defined in mailnews.wraplength.

How to start the configuration editor

Options> Details> Settings Editor

Screen image when receiving on smartphone

Since many smartphones can not display characters of 72 bytes (36 full-width characters) on a line, mail sent from Thunderbird becomes difficult to read because the paragraph changes every 72 bytes.

Reception example

How to use Toggle Word Wrap

When installing Toggle Word Wrap, "Enable Word Wrap" appears in the option of the mail compose screen. When unchecked, 72 bytes of line feed will be invalid only for the mail being created.