Send outgoing text/plain as format=flowed

Outgoing text/plain mail can be formatted as format=flowed according to rfc2646.

We already have a method in FlowedMessageUtils from an the apache-licensed Apache James project, so this should only be a matter of calling the right method at the right place.

Starting point should be around MessageBuilder.buildBody

[benbucksch]

@cketti , @Valodim : Format=flowed solves a number of real world issues with plaintext. It not only allows wrapping lines properly and adapting to different screen sizes (which is particularly important for mobile clients like K9Mail) and avoids “comb wrapping”, but also specifies clearly how quotes should look like, unambiguously fixes the mbox “From at the start of the line” issue in a reversible way etc…

format=flowed is essentially plaintext mail done right.

Please note that you already do implement format=flowed (RFC 2646), in FlowedMessageUtils.java.flow().

Ben (Thunderbird developer who implemented a lot of the plaintext processing, but not the format=flowed part, and thinks that format=flowed solved a lot of issues and saved me hairs.)

[ghost]

In Thunderbird format=flowed is default and is used. It only uses quoted-printable for pgp messages. A lot of the email I send isn’t actually encrypted.

I have found wrapping works reliably with format=flowed particularly on mobile devices.