us.edu\]
Note that the square brackets are retained as part of the SMTP envelope:
RCPT To:
?†? square brackets retained
F=U ?§20.8.47 on page 781 Use UUCP-style From line.
F=v Reserved for SysVR4.
F=V Reserved for UIUC.
F=w ?§20.8.48 on page 781 Check for valid user identity (V8.7 and later).
F=W ?§20.8.49 on page 782 Ignore host status for this delivery agent (V8.13 and later).
F=x ?§20.8.50 on page 782 Need Full-Name: in header.
F=X ?§20.8.51 on page 782 Delivery agent needs RFC2821 hidden dot.
F=z ?§20.8.52 on page 783 Deliver with LMTP (V8.9 and later).
F=Z ?§20.8.53 on page 783 Apply DialDelay option??™s sleep (V8.12 and later).
F=~ Reserved for SGI (check for valid home directory).
Table 20-19. Delivery agent F= flags (continued)
Flag ?§ Meaning
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
762 | Chapter 20: The M (Mail Delivery Agent) Configuration Command
The F=0 delivery agent flag is another way to suppress MX lookups. To illustrate, consider
using this delivery agent flag with FEATURE(nullclient) (?§17.8.38 on page 637):
FEATURE(`nullclient??,`mail.us.edu??)
Here, all mail will be forwarded to mail.us.edu. To suppress MX lookups, we could
surround the address with square brackets:
FEATURE(`nullclient??,`[mail.us.edu]??)
But this is unattractive and unnecessary.
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