S/MIME and displaying of eml attachments

snertev

I've received from an administrative office via IMAP an email that is apparently sent as a S/MIME envelopment in which is encapsulated a .eml file to which are attached a couple of PDFs.

While Thunderbird 115.7 is able to display both text and attachments, latest stable Vivaldi Mail gives me a blank page and 2 options: "download all attachments" and "show all attachments" that do the same thing, this is to say locally saving all attachments (digital signature file & .eml file with PDF attachments).

I supposed I could open the .eml file in Vivaldi Mail, but when I try to do so from Win 11 File Explorer, Vivaldi Mail shows to me another blank page.

Is there any way to display or import such a .eml attachment or the download .eml file directly in Vivaldi Mail? I don't want to keep Thunderbird around just to open these emails that I will regularly receive.

Unfortunately, I cannot provide the original mail because is under a Non disclosure agreement.

DoctorG

@snertev S/MIME decryption and signature check is not implemented yet in Vivaldi Mail, but planned for later.

snertev

@DoctorG said in S/MIME and displaying of eml attachments:

@snertev S/MIME decryption and signature check is not implemented yet in Vivaldi Mail, but planned for later.

Thanks.

But the eml attachment locally downloaded is a plain text MIME email. I can display it in whatever text editor (without verifying the signature and seeing the PDFs) except Vivaldi Mail.

In fact I know the email is sent from Outlook 16 with these extrapolated headers:

This is a multipart message in MIME format.

------=_NextPart_000_000C_01DA504B.DD017340
Content-Type: multipart/alternative;
	boundary="----=_NextPart_001_000D_01DA504B.DD017340"

------=_NextPart_001_000D_01DA504B.DD017340
Content-Type: text/plain;
	charset="us-ascii"
Content-Transfer-Encoding: 7bit

snertev

I forgot a header:

------=_NextPart_000_000C_01DA504B.DD017340
Content-Type: application/pdf;
	name="20240125141015_19_0.pdf"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
	filename="20240125141015_19_0.pdf"

DoctorG

That is a nasty, known bug in Vivaldi Mail.
Related to VB-65461 [MAIL] unable to properly parse email forwarded as an inline attachment to another email. - Confirmed.

snertev

@DoctorG said in S/MIME and displaying of eml attachments:

That is a nasty, known bug in Vivaldi Mail.
Related to VB-65461 [MAIL] unable to properly parse email forwarded as an inline attachment to another email. - Confirmed.

Well, at least it's a bug and not a feature.

Then, if it is confirmed we have only to wait

DoctorG

@snertev The broken mail display is the bug.
Missing S/MIME signature-check/decryption is the missing feature.

snertev

@DoctorG Just to be sure: does the bug consist in Vivaldi Mail client unable to display attached emails in an inline way and that it is unable to display .eml attachments when opened from Windows Explorer file manager?

I've found another test case: my internet provider uses SpamAssassin to label mail as spam. It forwards to me a main email with SpamAssassin warning to which is attached the original email in .eml format. If I try to open the attachment directly from Vivaldi Mail or I locally save it on my SSD and then try to open it in Vivaldi Mail, I get an empty white window and nothing more.

In this casa, as in the other ones, I need another app that supports .eml opening in order to see the attached emails.

DoctorG

@snertev 1. Vivaldi Mail can not display a attached .eml file, only download.
2. Vivaldi can not open a .eml file, gives white content.

mossman

@DoctorG said in S/MIME and displaying of eml attachments:

@snertev 1. Vivaldi Mail can not display a attached .eml file, only download.
2. Vivaldi can not open a .eml file, gives white content.

That doesn't seem to be true for me - unless Vivaldi's EML stored messages are different from other EML files.

I searched for EML files on this laptop and only came back with files in Vivaldi's own mail store. Both Vivaldi (and Outlook) can open them just fine. I notice that Vivaldi showed the plain-text version while Outlook showed the HTML version... if you tested a message with no plain-text included, maybe that's what made you say it only gives white content?

snertev

@mossman said in S/MIME and displaying of eml attachments:

@DoctorG said in S/MIME and displaying of eml attachments:

@snertev 1. Vivaldi Mail can not display a attached .eml file, only download.
2. Vivaldi can not open a .eml file, gives white content.

That doesn't seem to be true for me - unless Vivaldi's EML stored messages are different from other EML files.

I searched for EML files on this laptop and only came back with files in Vivaldi's own mail store. Both Vivaldi (and Outlook) can open them just fine. I notice that Vivaldi showed the plain-text version while Outlook showed the HTML version... if you tested a message with no plain-text included, maybe that's what made you say it only gives white content?

Indeed, if you see the email headers I posted above in this thread, that eml message had a text/plain part, but it was displayed as an empty window in Vivaldi when opened from Windows Explorer file manager.

snertev

Ah, and here we're talking about eml that are messages with attached other messages.

mossman

Yes, I think I've had that problem as well (usually annoying mails from Outlook users). I was testing if Vivaldi shows a white screen when opening files by entering the file path as address (since I don't want to mess with associations on this corporate laptop).

DoctorG

@snertev Yes, it does not work with mails having other mails embedded as attachments, i see that with Spamassassin on my mail server.