domain ESMTP Sendmail 8.14.1/8.14.1; Fri, 14 Dec 2007 14:13:09 -0700
HELO yourhost
250 yourhost.domain Hello your@yourhost.domain, pleased to meet you
MAIL From:
250 2.1.0 ... Sender ok
If machines at your site routinely send unqualified envelope sender addresses (addresses
without the @domain part), you will find that mail is being rejected.
Your first attempt at a solution should be to fix the broken software that is sending unqualified
addresses. If that fails, or if you lack the permission or authority, you can use this
accept_unqualified_senders feature to force sendmail to accept unqualified envelope
sender addresses:
FEATURE(`accept_unqualified_senders??)
Another way to handle this problem is with the (V8.10 and later) DaemonPortOptions
option??™s Modifier key value (?§24.9.27.7 on page 996). If that value includes a u character,
unqualified envelope sender addresses are accepted even if this feature is omitted. Even if
this feature is included, the presence of an f in the DaemonPortOptions option??™s Modifier key
value causes the normal behavior of enforcing fully qualified addresses.
17.8.2 FEATURE(accept_unresolvable_domains)
Accept unresolvable domains V8.9 and later
The MAIL From: command of the SMTP transaction is used to convey the address of the
envelope sender. RFC821 requires that the envelope sender address always be fully qualified.
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