> * The content-transfer-encoding of the message "git send-email" sends out by default was 8bit, which can cause trouble when there is an overlong line to bust

> * The content-transfer-encoding of the message "git send-email" sends out by default was 8bit, which can cause trouble when there is an overlong line to bust RFC 5322/2822 limit. A new option 'auto' to automatically switch to quoted-printable when there is such a line in the payload has been introduced and is made the default. Nice to see this one land. That was a pretty annoying usability problem for with the send-email command, and a barrier for people less knowledable about git using it.