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9/12/25
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>> Generally I would support software that supports as much standards as > >> possible. But in this case I think it is more rationale to keep the > >> old behaviour (as in RFC2047), because this brakes a large amount of > >> clients. Especially when RFC2047 is not deprecated/bad standard or > >> something and the necessity for RFC2231 is questionable. > > > > RFC 2047 is not a deprecated/bad standard as you note. But RFC 2047 > explicitly *forbids* traditional MIME encoding in parameter values. > See RFC 2047[5]: > > > > An [RFC 2047] 'encoded-word' MUST NOT be used in parameter of a > > MIME Content-Type or Content-Disposition field > > > > The necessity isn't "questionable", it is required. 2231 describes > the justification. See also http://weblog.timaltman.com/node/834 > > > >> Also, I must note, that this is not the problem with attachment name > >> display only. It seems that everytime I try to save such attacment it > >> is saved under different name. For example if I get ATT0001.zip in > >> outlook and save it, filename on disk becomes ATT00020.zip. This is > >> very confusing. > > > > We can't control behavior on other clients. RFC 2047-like parameter > encoding may work w/outlook clients, but it doesn't work on other > clients. When confronted with differing behaviors, the choice is to > pick the standards way which is what we have done. > > > > FYI, Opera, Thunderbird, and KMail (at a minimum) send w/ correct > 2231 encoding. TheBat! was recently fixed to support 2231 decoding, > so upgrade if that is an issue (see > https://www.ritlabs.com/bt/view.php?id=4197) > > > > Same issue as always - we are not going to fail to update our > software/be standards compliant based on the actions of a single/few > pieces of software. > > > > Additionally, preserving correct filename information, in the grand > scheme of things, is probably the least important element of mail > delivery, especially considering some browsers can't reliably > download filename information anyway.
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