Bug: lmtp proxy does not quote local parts with spaces

[Alexander Dalloz]

Am 26.10.2017 um 12:20 schrieb David Zambonini:
> 
> There seems to be a bug with RFC822 processing in ltmp proxying that doesn't
> quote local parts that, for example, contain spaces.

Newer related RFCs are RFC 5321 and 5322.

[ ... ]

> MAIL FROM:<test at testdomain.com>\r\n
> RCPT TO:<deemzed.uk+Junk E-mail>\r\n
> 
> 501 5.5.4 Invalid.parameters\r\n

That recipient address is totally invalid. It is neither just a local 
part without a domain, nor a plussed address destination.

Check your setup with i.e.

RCPT TO:<"Junk E-mail"@deemzed.uk>

or

RCPT TO:<"test+Junk E-mail"@deemzed.uk>

Alexander