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Hello, we had a problem with Message::getHeaders() method when loading an email sent from Office365. The currently used imap_headerinfo did not load the Message-ID header's value at all. After some research we've found, that the problem is in Office365 including a newline before the value of the header.

An example of 2 emails, one sent from Office365, another from gmail:

Message-ID:
BYAPR04MB4021C4D3B9FD3A1BF451D2268C2F0@BYAPR04MB4021.namprd04.prod.outlook.com

VS

Message-Id: [email protected]

We fixed this by changing the https://github.com/ddeboer/imap/blob/4d3b31c7cc5eb3cf3a8a0369fabd0d6e3f39cede/src/Message.php#L155 line to:

$headers = \imap_rfc822_parse_headers($this->getRawHeaders());

Even though it's slower, it parses the value correctly.

Partial duplicate of https://github.com/ddeboer/imap/issues/385

We know the issue, but the performance impact of imap_fetchheader is huge.

A solution is still under research

The thing is, is this a bug in Office365 or in PHP's imap_headerinfo function? Maybe we should open a bug report in PHP?

I have the same issues with the In-Reply-To header.