Inline Signatures

in2ndo's Avatar


13 Oct, 2019 03:42 AM

Sorry for the double post. I don't know how the first one got marked as private.

Which of our tools is giving you problems? Mail plugin

Attach a screenshot of the version info for all installed components (how to:

Just installed Catalina and gpg is not reinstalled yet.

Describe your problem. Add as much detail as possible.

Is there an easy way to change back and forward between inline and MIME signatures?
Some of my recipient networks don’t accept emails with attachments.

What did you expect instead

An option or button on the email program to change back and toward between the two.

Describe steps leading to the problem.

Sent signed emails rejected by the receiving server. Due to attachments .

Are you using any other plugins?


  1. Support Staff 1 Posted by Steve on 14 Oct, 2019 02:33 PM

    Steve's Avatar

    Hi in2ndo,

    welcome to the GPGTools support platform. Sorry you are having problems using GPG Suite.

    GPG Mail on macOS 10.12 and newer does not support the PGP/Inline format. As a workaround for recipients relying on that undocumented format, you could use GPG Services: KB explaining how to encrypt and sign text or files

    Can you share some information as to the setup not accepting PGP/MIME or in the specific case no attachments at all?

    GPG Mail defaults to the only standard there is for sending OpenPGP Emails, which is PGP/MIME. The format you are referring to, is called PGP/Inline and is an undocumented non-standard format. That leads to several problems, thus we default to PGP/MIME.

    While PGP/MIME allows to encrypt attachments, OpenPGP/Inline currently does not. Also, you are limited to text only. Any formatting will be ignored.

    To learn more about the deficits of Inline/PGP we recommend this note of Daniel Kahn Gillmore: Inline PGP signatures considered harmful. This is the GnuPG FAQ entry covering the issue.

    All the best,

  2. Support Staff 2 Posted by Luke Le on 12 Nov, 2019 02:59 AM

    Luke Le's Avatar

    Hi in2ndo,
    we wanted to get you up to date in regards to GPG Mail for macOS Catalina:

    GPG Suite 2019.2 is very close to being complete and ready for public release and here is Release Candidate 2 of GPG Suite 2019.2 including GPG Mail 4 which adds macOS 10.15 compatibility.

    Once GPG Suite 2019.2 is publically released, you will automatically be notified. Just make sure that update checks are enabled in System Preferences › GPG Suite.

    We are very sorry that this release took longer than we had anticipated.



  3. Support Staff 3 Posted by Steve on 23 Nov, 2019 10:03 PM

    Steve's Avatar

    Quick update: GPG Suite 2019.2 is available on our Website and includes GPG Mail 4 adding compatibility with macOS Catalina.

    Automatic updates will follow.

  4. Steve closed this discussion on 23 Nov, 2019 10:03 PM.

  5. Steve closed this discussion on 31 May, 2021 06:14 PM.

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