GitHub user sebbASF opened an issue:
https://github.com/apache/incubator-ponymail/issues/149
Bug: code assumes that subject is always present in an e-mail
The code assumes that a subject is always present in an e-mail; however
that may not be the case.
According to RFC822, the only required fields are:
```
fields = dates ; Creation time,
source ; author id & one
1*destination ; address required
*optional-field ; others optional
```
i.e. the Subject may be omitted entirely
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