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Compatibility with ProtonMail for HTML and attachments
Open, LowPublic


There is a report that sending emails with either

  • HTML
  • attachment(s)

to ProtoMail has problems.
The other way round works.

(The current version of Gpg4win is 3.1.10, though the version used for the report was not indicated.

Next steps:

  • Reproduce problem.

It may (or may not) be feasible to add a workaround for protonmail.
The recipients for protonmail can be detected via their maildomain names.
Then if it is only a small way to use deprecated-no-mime OpenPGP format, it could be selected.
A warning or selection could come up for several recipients.

From the value side:
An argument for adding a workaround is that there are many ProtonMail users,
which value privacy. And it is hard to support the real standard OpenPGP/MIME with a web client.

Event Timeline

aheinecke triaged this task as Normal priority.
aheinecke added a subscriber: aheinecke.

I've sent a mail to a protonmail dev asking if protonmail supports PGP/MIME.

The user in the Forum is apparently using the PGP/Inline option which explains why he has problems with attachments and HTML because they are not supported with PGP/Inline and GpgOL falls back to PGP/MIME.

aheinecke lowered the priority of this task from Normal to Low.Aug 30 2019, 9:09 AM

I've sent multiple PGP/MIME mails in various formats to a protonmail developer and all worked fine. So we have confirmed that protonmail and GpgOL are generally compatible.

So this gets a bit stranger as it seems to be a personal problem.