Use quoted-printable encoding for long plain-text lines
Sending emails through GMail (and other big tech email servers) will force-wrap lines to be 78 characters at most.
This breaks the integrity of the text, which could be line oriented (e.g. commands to a bug-tracker or a list-server).
A potential solution is to use quoted-printable Content-Transfer-Encoding.
Source/further-reading: https://mathiasbynens.be/notes/gmail-plain-text