Hi!
On 12/18/25 07:36, Bron Gondwana wrote:
On Wed, Dec 17, 2025, at 21:51, Hannah Stern wrote:
In body change recipes, section 5 of the draft, b: can insert base64
encoded content (i.e. that has been removed or changed at some point).
It doesn't encode the final CRLF, but can encode intermediate CRLFs if
it encodes multiple lines. Can it be specified (or considered as if
specified) that a b: recipe is invalid if it encodes bare CR or bare LF
or other characters that are not 7-bit valid characters within an
Internet Message body?
A b recipe is invalid if it encodes any CR or LF.. You can't encode
multiple lines. If you want multiple lines, each is a separate b: item.
I think that's heaps better than allowing them and having the client
have to interpret the output as potentially multiple lines.
Unfortunately it looks to me that the draft says (section 5):
b: base64string
Decode the base64string to get the value of a line to be inserted.
If the base64string contains an encoded CRLF then more than one
line is being added but note that a CRLF will automatically be
added after the decoded text -- i.e. if only one line is being
added there MUST NOT be an encoded CRLF present. If the
base64string is absent then a blank line is being added.
So if you're right that the actual intention was to allow only single
lines for each body b: recipe, the draft might need to be changed.
(For header b: recipes, a bit below in the draft text in the same
section, yes, the draft forbids CRLF, especially as it's not needed
anyway with the relaxed style header canonicalization.)
Bron.
Hannah.
--
Hannah Stern
Software Developer
Mail Transfer Development
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