Github user sebbASF commented on the issue:
https://github.com/apache/incubator-ponymail/issues/124
The problem here appears to be caused by the format of the In-reply-To
header, which is:
```
In-Reply-To: Your message of "Mon, 26 Jun 2000 13:39:14 EST."
<v04220802b57d53b791bc@[144.92.158.196]>
```
This is legal according to RFC822.
The code does not normalise the IRT reference (this is possibly due to the
mail parsing library).
This means the referenced mail cannot be found, causing the error.
The code should also handle the error better and show a more useful message.
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