We recommend following settings for Thunderbrid email client.
If you have one of our email accounts like @peerfreedom, then see EmailCig1 .
Disable HTML emails, use plaintext
By the way it contains the setting for Forward-as-attachment (as described below), check that option as well.
Forward as attachment
Reason: because then you forward also all meta-data/headers of the email (good e.g. for security/authentication for legal emails)
Check this option in global settings (see images above).
Thunderbird cannot add certificate exception to an IPv6 server connected via its IP due to bug.
You can fix that, by adding fake hostname in
/etc/hosts, and using it as server address.
And then use
somename as server address in Thunderbird.
It also can be achieved by setting manual proxy as localhost:9050 SOCKS v5 with DNS Proxy.
To do that do to Preferences -> Advanced -> Network & Disk Space -> Connection Settings, and then:
Manual proxy configuration:
SOCKS Host: localhost Port: 9050 SOCKS v5 DNS Proxy when using SOCKS v5
How to use ISO date format
If LC_TIME is set to en_US.UTF-8, for example, the date format will be "MM/DD/YYYY". If wanting to use the ISO 8601 date format of "YYYY-MM-DD" set environmental variable before starting Thunderbird: