MailboxAddress formating with folding

[jlynema]

I am using Mimekit to create and send SMTP messages and has been going well, but we are running into an unexpected problem with long friendly names in the "FROM" header.
As an example, when I create a MailboxAddress to assign to the from with the following
var fromAddress = new MailboxAddress("allowable length of some number of char is exactly the allowable length of some number of char.", "[email protected]");

I get the following output when I "ToString(false)"

"allowable length of some number of char is exactly the allowable length of some number of char." <[email protected]>

but the following output when I "ToString(true)"

allowable length of some number of char is exactly the allowable length of
 "some number of char." <[email protected]>

The resulting Mime when I serialize with WriteTo comes out as follows:

From: allowable length of some number of char is exactly the allowable length
 of "some number of char." <[email protected]>

Is this correct? This is causing problems downstream for us with other mail clients. I've tried setting FormatOptions.International as well, but that doesn't change the output.
When the friendly name is even longer it gets more interesting

From: allowable length of some number of char is exactly the allowable length
 of
 "some number of char. allowable length of some number of char is exactly the allowable length of some number of char."
	<[email protected]>

[jlynema]

For my code, it seems to fold and add extra quotes once the length of the friendly name hits 77 characters

[jstedfast]

These examples are all the expected result except maybe the last one which seems like the logic could be improved but is still valid output.

What you have to understand is that the rules for addresses make the following criteria:

1. . needs to be quoted
2. quoted-strings are meant to get unquoted by the parser on the receiving end
3. If the sending client wishes for the double-quotes to remain, then it must do "This is a \"nested quote\" which will remain" <[email protected]>

Once you understand all of those rules, you can clearly see that the output that MimeKit produces is correct and that the display of the receiving mail client (Outlook?) is wrong.

There is a similar discussion here: #1093