Hello!
I am facing issue in Outlook. When I receive a message, it is displayed correctly, however, when I forward it using the Forward option, the message is corrupted - a blank line appears in email headers space, which causes that header fragments are visible in the body of the email and styles are not supported, email content is unreadable.
Forwarding by another email client works fine.
I discovered that part of the subject in the header of the message is causing the problem.
This is an example (I replaced the characters in the subject with X - I don't want to show the real subject of the message):
Subject: =?UTF-8?Q?=EF=BB=BFXXXXXXXXXXXXXXX?=
=?UTF-8?Q?XXXXXXXXXXXXXXXXXXXXX=0A?=
The received message is displayed correctly, sent message on my pc is also fine, but the recipient see something like this as message content in his Outlook:
?=
Date: Tue, 23 Mar 2021 13:34:04 +0100
Message-ID: <XXXXXXXXXXXXXXXXXXXXXXXXXXXX>
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="----=_NextPart_000_000F_01D71FE9.31651C70"
X-Mailer: Microsoft Outlook 16.0
Thread-Index: AQHx6EJ7ykzvMX6XeA/uZYM/xW4IcKpb8Q7w
Content-Language: pl
X-MS-TNEF-Correlator: 0000000027D4818939C97348950E6BEC6CE1B41D0700C3B68E10F77511CEB4CD00AA00BBB6E600000000000D0000C59801D164471F4A9EC6173D4082200E000000001C0D0000
This is a multipart message in MIME format.
------=_NextPart_000_000F_01D71FE9.31651C70
Content-Type: text/plain;
charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
and there is broken body without HTML style, just plain text with HTML code.
I discovered that if I change manually subject (by deleting the UTF8-BOM signature) with text editor to:
Subject: XXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXX
Forwarding is handled properly.
If I click "Forward" and manually change subject of email in outlook create message window - it works!
Also forwarding is handling properly with sending using MAPI with original subject. Sending with SMTP doesen't works well with Outlook - works with different clients.
Is there anything I can do about this in Outlook? Forwarding is working fine in different email clients (web clients and dekstop clients).
Outlook specs:
-Incoming protocol: IMAP
-Outgoing protocol: SMTP
Doesen't work in outlook 2019 and 2016.
