The trailing = is usually caused by the text encoding of "quoted Printable"

https://en.wikipedia.org/wiki/Quoted-printable

~Barton


On Thu, Feb 1, 2018 at 7:27 PM, Yubin Ruan <[email protected]> wrote:
> On Fri, Feb 02, 2018 at 02:06:35PM +1100, Cameron Simpson wrote:
>> On 02Feb2018 10:25, Yubin Ruan <[email protected]> wrote:
>> > I try to save a multipart/alternative attachment to file but all the 
>> > content
>> > seems to be messed up. When view in a pager, it look good:
>> >
>> > --------------------------------
>> > LinkedIn Highlights
>> >
>> > Should I tell coworkers my salary?
>> >
>> > 264 people are talking about this
>> >
>> > https://www.linkedin.com/comm/search/results/content/?keywords=Should+I+tell+coworkers+my+salary%3F&origin=FED_EMAIL&anchorTopic=506458&midToken=AQFSR-6AohV2qQ&trk=eml-email_feed_ecosystem_digest_01-hero-1-null&trkEmail=eml-email_feed_ecosystem_digest_01-hero-1-null-null-6mvow3%7Ejd475j9d%7Ey4-null-neptune%2Fsearch%2Eresults%2Econtent&lipi=urn%3Ali%3Apage%3Aemail_email_feed_ecosystem_digest_01%3BrxyHuw3NTWi4n8fHNW81ig%3D%3D
>> > ---------------------------------
>> >
>> > However, when saved to a file, it become:
>> > (which is the same as in editor when you press 'e' to edit the email)
>> >
>> > ------------------------------------
>> > LinkedIn Highlights
>> >
>> > Should I tell coworkers my salary?
>> >
>> > 264 people are talking about this
>> >
>> > https://www.linkedin.com/comm/search/results/content/?keywords=3DShould+I+t=
>> > ell+coworkers+my+salary%3F&origin=3DFED_EMAIL&anchorTopic=3D506458&midToken=
>> > =3DAQFSR-6AohV2qQ&trk=3Deml-email_feed_ecosystem_digest_01-hero-1-null&trkE=
>> > mail=3Deml-email_feed_ecosystem_digest_01-hero-1-null-null-6mvow3%7Ejd475j9=
>> > d%7Ey4-null-neptune%2Fsearch%2Eresults%2Econtent&lipi=3Durn%3Ali%3Apage%3Ae=
>> > mail_email_feed_ecosystem_digest_01%3BrxyHuw3NTWi4n8fHNW81ig%3D%3D
>> >
>> > =20
>> > -----------------------------------
>> >
>> > I know the tailing = at the end is to enable the pager to prettify thing. 
>> > But
>> > can we save directly from the pager?
>>
>> I don't think this is anything to do with locales.
>>
>> I'm presuming you're talking about saving something from the attachment
>> menu?  And not about saving a message complete.
>>
>> What you show above is interesting.
>>
>> It looks to me like the second version, the folded lines ending in "=", is
>> quoted-printable, which encoded most ASCII range text as itself, with escape
>> sequences for various bytes not in the common lower range and of course for
>> the escape character "=" itself. Its purpose it to get text through various
>> systems undamaged while keeping it visually fairly readable.
>>
>> Normally, that would be the attachment's Content-Transfer-Encoding, which I
>> would expect to be decoded on save, because the attachment is no longer
>> enclosed in a mail message structure.
>>
>> Apparently not the case.
>>
>> Can you describe _exactly_ what procedure your went through to save this
>> message, from the index view (list of message titels/authors only) through
>> to saving the file? So that we can reproduce what you've done and understand
>> it?
>
> Procedure:
>   1. enter the attachment view using 'v'
>   2. go the attachment you want to save,
>   3. press 's', which will prompt you for a file name to save the file with
>
> FYI: those tailing = are not generated by Mutt. I am using Gmail, and through
> Gmail's web interface I can confirm that the original mail already have those
> tailing = .
>
> --
> Yubin

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