Allow parsing of oversized lines. Using this option is discouraged.

Always write the content-transfer-encoding, even if it has default value of "7bit"

Do not include encryption key preference attribute in signed message attributes.

Disable a workaround for broken mail clients such as Mac mail that don't correctly parse HTML-only messages. By default, MailMessage class constructs a single-part multipart/alternative structure to solve this. This property turns off this behavior.

Do not include S/MIME options attribute in signed message attributes.

Do not automatically add a date header if 'date', 'subject' or 'from' headers are missing from a top-level or embedded message.

Ignore the MIME tree and parse the message as a single-level entity.

Disable encoding of leading 'F', '.' and '-' character in body parts using quoted-printable content transfer encoding. These leading characters used to cause problems to legacy mail transfer agents, so quoted-printable-encoding them was used as a workaround that doesn't cause any problems to properly-implemented mail agents.

Instructs the MIME header parser not to trim MIME headers while parsing them.

Ignore invalid TNEF (winmail.dat) attachments when parsing mail message.

Ignore TransportMessageHeaders field when loading .msg file. If set to true, some fields are taken directly from the .msg structure instead of the TransportMessageHeaders field. The affected fields are: Sender, From, To, CC, Bcc, Subject, Date, MessageId. Any MIME headers stored in TransportMessageHeaders field are not loaded either.

Ignore unparsable headers when parsing mail message.

Ignore unparsable S/MIME signature entities when parsing mail message.

Load Outlook MSG properties into custom MIME headers. All these MIME headers start with X-Outlook- string.

Only parse message headers and ignore the body.

Prefer BodyText and BodyHtml to be taken from its original .msg message fields. Default is false, which means BodyText and BodyHtml are taken from BodyRtf if possible (if embedded).

Parse and reencode all headers, even when not needed or modified.

The mode to process RTF in mails.

Skip certificate usage check.

Skip sender check.

Skip TNEF (winmail.dat) attachment processing. If specified, the 'winmail.dat' attachment is not processed at all.

Treat sub-entities of 'multipart/mixed' as attachments even if their Content-Disposition is 'inline'.