Note that
these are the same delivery agent flags smtp uses, but withth e F=a and F=% delivery agent
flags added. The F=a delivery agent flag enables support for ESMTP. The F=% delivery agent
flag causes all outbound email to be queued instead of sent, and not attempted on normal
queue runs. This is extremely useful at a site that is polled only for email. A server with
only dial-up accounts might be one example, or a server outside a firewall that is not
allowed to pushmail inward. Withth e F=% delivery agent flag set, destination hosts need to
request delivery with the ETRN command (?§11.8.2.6 on page 433). The local administrator
can also cause delivery to occur withth e -qI, -qR, or -qS command-line switches
(?§11.8.2.3 on page 431).
20.4.13.5 The relay delivery agent
The relay delivery agent uses TCP to connect to other hosts. It speaks ESMTP and has the
F=mDFMuXa8 delivery agent flags set by default (see ?§20.5.2.2 on page 739 for the meaning of
these delivery agent flags). Note that these are the same delivery agent flags smtp uses, but
withth e F=a and F=8 delivery agent flags added. The F=a delivery agent flag enables support
for ESMTP. The F=8 delivery agent flag forces sending 8-bit data over SMTP even if the
receiving server doesn??™t support 8-bit MIME. The relay delivery agent also uses an L=
(?§20.5.7 on page 745) setting of 2040.
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