"<unknown sender>" when the sender name has a ":"

[dddns]

Checklist

• [X] I have used the search function to see if someone else has already submitted the same bug report.
• [X] I will describe the problem with as much detail as possible.

App version

latest

Where did you get the app from?

None

Android version

10

Device model

samsung

Steps to reproduce

Howdy,

If the sender, has in it's client the name as "email: john" and send's an email to me, and i see it in K9, K9 translated the sendername to "unknown server", If you need any further indo let me know, i saved the messaged.

Expected behavior

Display name as it is

Actual behavior

wrong displayed information

Logs

sdfg

[dddns]

Hum, K9 is coding the header, the real, is indeed in quoted printable

From: =?utf-8?Q?Email:_Dire=C3=A7=C3=A3o?= direccao@-----.pt

[cketti]

This is an invalid encoding. The display name needs to be an RFC 5322 phrase. A : is only allowed in a quoted string or in encoded form in an RFC 2047 encoded word.

Did you use K-9 Mail to create this email? Or did some other email client create this header?