But if that is the case, you will need a
sending mail hub with good DNS access so that you can reply to such messages.
You can accept suchaddresses by defining the FEATURE(accept_unresolvable_
domains):
FEATURE(`accept_unresolvable_domains??)
This tells sendmail to accept all envelope-sender addresses, even if the domain part
following the @ cannot be looked up with DNS.
7.4.11 FEATURE(accept_unqualified_senders)
The sendmail program refuses to accept a message if the address specified as part of
an SMTP MAIL From: command lacks a domain. That is, if the address has a user part
but lacks the @ followed by a domain, the message will be rejected:
MAIL From:
?†? good, has a domain part
MAIL From: ?†? bad, lacks a domain part
Some mail submission programs will submit mail without including a domain part.
Improperly configured PCs are one example, as are poorly configured Unix hosts.
Generally, such problems will appear on your local network. If you lack the authority
to fix sucha problem, you can tweak sendmail to accept suchaddresses by including
the FEATURE(accept_unqualified_senders) like this:
FEATURE(`accept_unqualified_senders??)
Note that this feature accepts unqualified addresses regardless of the port on which
they are received. Such a broad solution might be acceptable on an internal network,
but it is discouraged on machines that service the Internet.
Pages:
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513