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Special characters not displayed anymore in Outlook
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Special characters as umlauts (i.e. ä ö ü) in signed and sent emails do not get displayed anymore in Outlook. The characters are simply left out within the words, no space, just as if I didn't type them. However, when I open the sent email using my webmail provider there are no missing letters. So it is only a display problem in Outlook; the email itself seems to be unaffected.

It worked flawlessly before, it seems the bug appeared in GpgOL version 2.1.0 or one before.

The bug appears when I open a signed and sent email in Outook's Sent-folder. It affects both the email preview in Outlook as well as regular email window.

Odd enough, when I write a new mail and choose to sign it and finally send it, it is sent but Outlook then clears the text window (as if I didn't type a single letter). I can simply close the window manually and the email is sent. But that's a strange behaviour, maybe related to the bug above.


Gpg4win 3.1.1, GpgOL 2.1.1, MS Outlook 2013 x64 (15.0.5031.1000) on Win 10 Pro b16299 x64

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baluui updated the task description. (Show Details)
aheinecke triaged this task as Normal priority.
aheinecke added a subscriber: aheinecke.

Thanks for your report.

Do you have the Option to send PGP/Inline set?

We added support for PGP/Inline signing with GpgOL 2.1.0 which is notoriously problematic regarding encoding. So if you send PGP/Inline that would explain the change in behavior.

But it should work at least in your own client, of course.

Thank you for your answer.

I unticked the inline setting in gpgOL and yeah, it helped. Thank you! I would not have found it on my own.

What is the purpose/advantage of this setting if ticked?

The best way to send signed or encrypted mail is by using PGP/MIME which is the default.

The Inline setting is there because some people always request it as they somehow communicate with others that can't handle MIME. So it's a kind of compatibility option.

What did you think that the Option did when you selected it?
Maybe we need to rephrase the Option to avoid confusion.

aheinecke changed the task status from Open to Testing.Jun 1 2018, 2:32 PM

I've noticed during testing that GpgOL would not send valid PGP/Inline signed only messages and also failed to verify such messages itself when special characters were in the mix.

It is improved somewhat by the following commits:


Still not super reliable but for good encoding support users need to use PGP/MIME.

Fix is released in Gpg4win-3.1.2