[MlMt] NUL character warnings (v5246)

[Billy Youdelman]

Sherif Soliman wrote, quoting Scott A. McIntyre 
<mailmate at howyagoin.net>:

>> For the last few days I've been getting a LOT of these:
>>
>> Server response: “I71 NO Message contains NUL characters”. 
>> Command attempted: “I71 APPEND "INBOX.Sent Items" (\Seen) 
>> "20-May-2016 08:01:30 +1000" {696+}”.
>>
>> The IMAP server is FastMail, but the problem only started happening 
>> after a recent update in the last week.
>>
>> I had this issue in the past, and I know roughly how to fix it, but, 
>> not really sure what's repeatedly causing it.
>>
>> Anyone else seeing this?

> Yes, I got it at least twice in the last few days. Also with FastMail. 
> It happened when I would try to send a message.

I'm also using FastMail, but for another reason I'm still on MailMate 
v5142, and I'm not seeing this, at all.

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