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Mailing list digests in HTML often show up blank in Apple Mail
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Description

When I get an email from a mailing list, it often displays as blank in Apple Mail. I will attach screenshots.

Event Timeline

Could you forward two examples as attachments via email to me, including all their mail headers? Curious about the content structure...

Aklapper renamed this task from List postings often show up blank in Apple Mail to Mailing list digests often show up blank in Apple Mail.Dec 12 2016, 9:00 PM

@Krenair They are indeed all digests. Apologies, I should have included that in my original report.

@Aklapper Sent. They started displaying properly after I exported the email. So I am beginning to suspect it's an Apple Mail bug, though it's only showing on WMF digests.

Opens fine here in "Evolution" mail client and I don't see anything weird.
(Only one that surprises me a bit is the 0A byte within the "DKIM-Signature" header.)
I'd currently expect this to be an Apple Mail bug - could you file a bug report there? Closing here as this seems to be out of Wikimedia's control.

Reported to apple, ticket rEWME296799441745 (Though I'm sure I'm the only one who can see it). Thank you for the information.

Okay, reopening as I've been getting fully blank emails for about a month and a half. Tracked Apple #37170105, but if they come back we can continue digging down here.

Thanks to @Quiddity for looking into this via IRC.

Together with T180405 this makes me believe in bugs in Apple Mail. See https://discussions.apple.com/thread/7681395 . What is your setting for "Get MIME or Plain Text Digests?" on https://lists.wikimedia.org/mailman/options/evolution-list/your_email_address ? If it is MIME, does it work when switching to plain text?

@Aklapper I agree with you, there. Viewing that URL returns error "Error: No such list evolution-list" Viewing wikitech-l settings, I am encoding in MIME, will attempt to switch to plain text and update.

@Matthewrbowker: That's due to my horrible copy&paste skills, sorry. :)
I meant https://lists.wikimedia.org/mailman/options/mailing_list_name/your_email_address and you need to adjust the last two items accordingly.

@Matthewrbowker : Does this also happen with plain text?

Aklapper renamed this task from Mailing list digests often show up blank in Apple Mail to Mailing list digests in HTML often show up blank in Apple Mail.May 2 2018, 2:47 PM
Aklapper closed this task as Declined.

@Matthewrbowker : Does this also happen with plain text?

Unfortunately closing this report as no further information has been provided.

@Matthewrbowker: After you have provided the information asked for and if this still happens, please set the status of this report back to "Open" via the Add Action...Change Status dropdown. Thanks!

There has been no information from the Apple side of things either, the bug report I submitted on February 17 is still open. Will re-open if there's something actionable on the WMF end, but since plain text isn't affected I'm almost positive it's a Mail.app bug.