Internal Program Version: Email::Abstract  3.10.0.5.42.0

'Email::Abstract' provides module writers with the ability to write simple,
representation-independent mail handling code. For instance, in the cases
of 'Mail::Thread' or 'Mail::ListDetector', a key part of the code involves
reading the headers from a mail object. Where previously one would either
have to specify the mail class required, or to build a new object from
scratch, 'Email::Abstract' can be used to perform certain simple operations
on an object regardless of its underlying representation.

https://metacpan.org/release/Email-Abstract