Conversion to 7BIT required but not supported

[Damian]

> Here are logs with $log_level5:
> 
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) about to connect to smtp:[127.0.0.1]:10025, Pjqt83Ia4zs4 FWD from <someone at gmail.com> -> <dedwards at example.com>
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) get_deadline fwd_init - deadline in 478.5 s, set to 479.000 s
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) smtp session: setting up a new session
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) establish_or_refresh, state: down
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) new socket using IO::Socket::IP to [127.0.0.1]:10025, timeout 35
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) connected to [127.0.0.1]:10025 successfully
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) rw_loop: needline=1, flush=0, wr=0, timeout=35
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) rw_loop: receiving
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) rw_loop read 67 chars< 220 smtp SMTP Server ready Sun, 5 Jan 2020 08:39:40 -0500 (EST)\r\n
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) smtp greeting: 220 smtp SMTP Server ready Sun, 5 Jan 2020 08:39:40 -0500 (EST), dt: 2.7 ms

What kind of software is that on 127.0.0.1:10025? It's neither amavis
nor postfix.

> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) smtp cmd> EHLO localhost
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) rw_loop: needline=0, flush=1, wr=1, timeout=300
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) rw_loop: sending 16 chars
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) rw_loop sent 16> EHLO localhost\r\n
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) rw_loop: needline=1, flush=0, wr=0, timeout=300
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) rw_loop: receiving
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) rw_loop read 52 chars< 250-smtp Hello localhost (localhost [127.0.0.1])\r\n
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) rw_loop: needline=1, flush=0, wr=0, timeout=300
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) rw_loop: receiving
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) rw_loop read 65 chars< 250-PIPELINING\r\n250-ENHANCEDSTATUSCODES\r\n250 XFORWARD NAME ADDR\r\n
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) smtp resp to EHLO: 250 smtp Hello localhost (localhost [127.0.0.1])\nPIPELINING\nENHANCEDSTATUSCODES\nXFORWARD NAME ADDR
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) tls active=0, capable=, sec_level=0
> Jan  5 08:39:40 smtp amavis[32190]: (32190-01) Remote host presents itself as: smtp Hello localhost (localhost [127.0.0.1]), handles PIPELINING

No 8BITMIME.