JH/38 Fix cutthrough bug with body lines having a single dot. The dot was
incorrectly not doubled on cutthrough transmission, hence seen as a
body-termination at the receiving system - resulting in truncated mails.
- Commonly the sender saw a TCP-level error, and retransmitted the nessage
+ Commonly the sender saw a TCP-level error, and retransmitted the message
via the normal store-and-forward channel. This could result in duplicates
received - but deduplicating mailstores were liable to retain only the
initial truncated version.