2.4.0

What's Changed

• ReceivedHeader: incorrectly detects the IP address #152 by @mariuszkrzaczkowski in #153
• Keep multipart/alternative order for signed parts
• Fix issue setting mime content stream offsets
• Allow 'Received' hostnames without '.' chars #104
• Add 'getHeaderAs' for #140 #142
• Fix return value for getEmail

Full Changelog: 2.3.0...2.4.0