Header Encoding Detection Problem

[stefanullrich]

Describe the bug
There is a problem with the header encoding detection on certain mails (mainly spam mails).

While listing the content of a specific folder with something like

$messages = $folder->messages()->all()->get();

We are receiving an ErrorException:

Uninitialized string offset 0

Used config
Not using the php-imap extension itself.

Code to Reproduce
E.g. the mail has the following From-header:

...
Message-ID: <xxx_replaced_xxx@mail.gmail.com>
From: "\"High-Speed-Deal\" ." <info@spam.domain.invalid>
Date: Wed, 28 Aug 2025 12:31:41 +0000
...

Expected behavior
Mails should be parsed correctly and the message collection should be returned.

Desktop / Server:

• OS: Ubuntu 24.04
• PHP: 8.4.12
• Version: v6.2.0
• Provider: Exchange

Will create a PR for this.