Q: OS Sierra Mac Mail attachments missing

Hi Apple Support,

Can we have your immediate attention here, please? One of main mail features is not working, it's a critical issue.

Cheers,

Slaw

Same problem here. Since the update to Mac OS Sierra, some of the attachments are not there.

My solution until the fix is that I open the mail on my iPhone and upload the missing attachments to an iCloud Drive directory. Then I open iCloud Drive on my MacBook Pro and move the files to the destination.

It's bad, but I hope this will be fixed quickly.

There are new features in Sierra to reduce disk space usage.   One of them manages email attachment downloads.  Did you enable this feature in About This Mac/Storage/Manage?

Curt

Sierra sometimes omits the last attachment  and where there is only one attachment it is always missing.

It only seems to fail if the account is configured for IMAP access. POP access does not have the issue. Best send Apple feedback. Go to http://www.apple.com/feedback/macosx.html and let 'em know.

Thanks Chastings, but no, this feature is disabled. Even if it would be activated, the attachments should be there, because it affects newly received emails.

@trevoz: I can confirm that IMAP issue. I have configured several email accounts and it appears to me that only the IMAP account has missing attachments.

I reported this issue through the feedback assistant now, because I'm using the Public Beta.

http://www.apple.com/feedback/macosx.html

I'm seeing this as well on some messages.

I sent a test message with two photos to another of our email addresses. No photos showed up in the received message. And weirdly, the sent message disappeared.

Then I checked that received message with webmail and the photos are there. So it looks like a Mail 10.0, unless there's a new setting somewhere.

Here's another test:

I took a three-message thread where photos are missing and dragged it from On My Mac > Friends to myAppleID > Saved in iCloud.

Looking at my iCloud Mail in Safari, the photos show up.

I put the messages back in On My Mac > Friends and the photos do not show up.

So this looks a lot like a display bug in Mail, not actually disappearing attachments.

One more test:

I sent a message from a POP account and the images show in the sent mail as viewed within Mail.

My above comments apply to my iCloud account as the sending account. (But remain invisible when the receiving account is a POP account.)

Trevoz also mentioned this.

> (But remain invisible when the receiving account is a POP account.)

I think you meant either "visible" =or= "IMAP" account

The attachments are visible when using a POP account, but invisible when using an IMPA account.

Of course, I should have written "in my experience."

In one test, I sent a message with photos (placed inline) from my iCloud address to a POP address we receive mail from. The sending account was IMAP (iCloud), the receiving account was POP. The photos were not displayed in either the sent mail or the received mail. Note that this was on a single iMac with both addresses.

When I looked at the sent mail in Safari, logged into my iCloud account, the sent mail showed the images.

What has been confirmed to date by several users is that receiving mail using the IMAP protocol has the issue with the last (or only, if one) attachment not being shown whereas receiving mail using the POP protocol all the attachments are visible.

Perhaps what you are saying (if I understand correctly) is that you sent an email from an "account" which uses the IMAP protocol to receive mail and the SMTP protocol to send, and that the result was the the receiving "account" which used the POP protocol still did not show the attachment(s). Is this correct?