On 29/07/2019 13:54, Post-/Webmeisterei via Exim-users wrote:
> Debian Buster, exim4 4.92-8+deb10u1
>
> In sender address a unicode (U+FEFF) character (Zero Width No-Break
> Space (BOM, ZWNBSP))
>
> 2019-07-23 18:17:07 1hpxTO-0005QR-9B <= Kevin<feff>Smith@???
> H=(losaass.it) [193.106.43.215] I=[193.197.165.21]:25
> 2019-07-23 18:17:07 1hpxTO-0005QR-9B => xxx <xxx@???>
> 2019-07-23 18:17:07 1hpxTO-0005QR-9B ** xxx@??? R=sophos
> T=remote_smtp H=10.157.x.x I=[193.197.165.21]
> X=TLS1.2:RSA_AES_256_GCM_SHA384:256 CV=no: SMTP error from remote mail
> server after pipelined MAIL FROM:<Kevin\357\273\277Smith@???>
> SIZE=10231: 500 non-US-ASCII characters are not allowed in SMTP commands
>
> Next Hop, a Sophos UTM, rejects sender, Exim does not?
Exim doesn't care much (unless you tell it specially).
You might be interested in the internationalisation support,
http://exim.org/exim-html-current/doc/html/spec_html/ch-internationalisation.html
... though I don't know whether the Debian build includes that
(run "exim -bV", find the "Support for" line and look for I18N)
nor whether your next hop does.
--
Cheers,
Jeremy
