dovecot - Aug 2018 - Strange problem on lmtp with dovecot 2.3.2.1

Hi to all i have compiled and installed dovecot 2.3.2.1 on debian 6 with
success but now i'm facing a strange problem on communication from postfix
installed on server A with dovecot installed on server B (which version is
2.3.2.1). All incoming emails delivered from esternal from server A to
server B with LMTP is rejected with this message error

"smtpgw postfix/lmtp[1772]: 6194CA00B3: to=<xxxxxxxxxxxx at
mail.cgilfe.it>,
relay=192.168.10.50[192.168.10.50]:24, delay=0.02, delays=0/0.01/0.01/0,
dsn=5.5.4, status=undeliverable (host 192.168.10.50[192.168.10.50] said:
501 5.5.4 Invalid FROM: Missing domain (in reply to MAIL FROM command))"

I cant identify what is the problem , for now i have bypassed lmtp using
smtp but my goal is returning to lmtp that i have used since old versions
of dovecot.
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Hi,

Op 20/08/2018 om 18:01 schreef davide marchi:
> Hi to all i have compiled and installed dovecot 2.3.2.1 on debian 6 
> with success but now i'm facing a strange problem on communication 
> from postfix installed on server A with dovecot installed on server B 
> (which version is 2.3.2.1). All incoming emails delivered from 
> esternal from server A to server B with LMTP is rejected with this 
> message error
>
> "smtpgw postfix/lmtp[1772]: 6194CA00B3: 
> to=<xxxxxxxxxxxx at mail.cgilfe.it <mailto:xxxxxxxxxxxx at
mail.cgilfe.it>>,
> relay=192.168.10.50[192.168.10.50]:24, delay=0.02, 
> delays=0/0.01/0.01/0, dsn=5.5.4, status=undeliverable (host 
> 192.168.10.50[192.168.10.50] said: 501 5.5.4 Invalid FROM: Missing 
> domain (in reply to MAIL FROM command))"
>
> I cant identify what is the problem , for now i have bypassed lmtp 
> using smtp but my goal is returning to lmtp that i have used since old 
> versions of dovecot.
Dovecot v2.2. was extremely permissive regarding address syntax. Dovecot 
v2.3+ tends to be more strict, but if there's really an interoperability 
problem we can implement a workaround. First I'd like to know what 
exactly is going on. For some reason, your incoming mails have an 
envelope "from" address without a domain part, which is normally not 
allowed and makes little sense for messages exchanged on the internet. 
Any idea why that may be happening?

Regards,

Stephan.
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