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| If you want to filter content with Mailman's content filtering, but preserve HTML message formatting, there are a few things you must do. You must ensure that MIME type text/html is not removed. The normal way to do this is to put {{{text/html}}} in pass_mime_types along with your other settings. Adding this to the distributed defaults results in | If you want to filter content with Mailman's content filtering, but preserve HTML message formatting, there are a few things you must do. You must ensure that MIME type text/html is not removed. The normal way to do this is to put `text/html` in pass_mime_types along with your other settings. Adding this to the distributed defaults results in |
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| however, since there are other multipart sub-types that are commonly used such as {{{multipart/related}}}, a better option is | however, since there are other multipart sub-types that are commonly used such as `multipart/related`, a better option is |
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| The above will allow {{{text/html}}} and {{{text/plain}}} parts to remain in the messages after the initial filtering. You may also want to allow those parts to remain if they are sub-parts of an attached forwarded message {{{message/rfc822}}} part, and you may want to allow PGP signatures {{{application/pgp-signature}}} resulting in pass_mime_types containing | The above will allow `text/html` and `text/plain` parts to remain in the messages after the initial filtering. You may also want to allow those parts to remain if they are sub-parts of an attached forwarded message `message/rfc822` part, and you may want to allow PGP signatures `application/pgp-signature` resulting in pass_mime_types containing |
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| The above will allow {{{text/html}}} parts to remain after initial filtering, but in order that they pass the remaining steps unchanged, you must set | The above will allow `text/html` parts to remain after initial filtering, but in order that they pass the remaining steps unchanged, you must set |
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| to {{{No}}} so that a {{{text/html}}} alternative part is not removed in favor of a {{{text/plain}}} alternative, and | to `No` so that a `text/html` alternative part is not removed in favor of a `text/plain` alternative, and |
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| to {{{No}}} for the obvious reason. | to `No` for the obvious reason. |
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| Also, The list's {{{Non-digest options -> scrub_nondigest}}} setting must be {{{No}}} or the HTML part(s) will be stored aside and replaced in delivered messages by brief notes with the URL of the removed part. | Also, The list's `Non-digest options -> scrub_nondigest` setting must be `No` or the HTML part(s) will be stored aside and replaced in delivered messages by brief notes with the URL of the removed part. |
How do I preserve HTML formatting while filtering other content?
If you want to filter content with Mailman's content filtering, but preserve HTML message formatting, there are a few things you must do. You must ensure that MIME type text/html is not removed. The normal way to do this is to put text/html in pass_mime_types along with your other settings. Adding this to the distributed defaults results in
multipart/mixed multipart/alternative text/plain text/html
however, since there are other multipart sub-types that are commonly used such as multipart/related, a better option is
multipart text/plain text/html
The above will allow text/html and text/plain parts to remain in the messages after the initial filtering. You may also want to allow those parts to remain if they are sub-parts of an attached forwarded message message/rfc822 part, and you may want to allow PGP signatures application/pgp-signature resulting in pass_mime_types containing
multipart message/rfc822 text/plain text/html application/pgp-signature
The above will allow text/html parts to remain after initial filtering, but in order that they pass the remaining steps unchanged, you must set
Should Mailman collapse multipart/alternative to its first part content? (Edit collapse_alternatives)
to No so that a text/html alternative part is not removed in favor of a text/plain alternative, and
Should Mailman convert text/html parts to plain text? This conversion happens after MIME attachments have been stripped. (Edit convert_html_to_plaintext)
to No for the obvious reason.
Also, The list's Non-digest options -> scrub_nondigest setting must be No or the HTML part(s) will be stored aside and replaced in delivered messages by brief notes with the URL of the removed part.