The # is the error number, as
defined in /usr/include/errno.h.
The df file is opened only when processing the queue file, not when printing it. When
printing the queue, the df is stated so that its size can be printed.
11.12.6 E line
Send errors to V8.6 and earlier
Notification of errors often requires special handling by sendmail. When mail to a mailing
list fails, for example, sendmail looks for the owner of that list. If it finds one, the owner,
not the sender, receives notification of the error. To differentiate error notification
addresses from ordinary sender and recipient addresses, pre-V8.7 sendmail stored error
addresses separately in the qf file, one per E line. Beginning withV8.7, this E line is no
longer used. Instead, sendmail uses the S line.
The form of the E line in the qf file looks like this:
Eaddr ?†? V8.6 and earlier
The E must begin the line. One or more addresses can be entered on that same line.
Whitespace and commas can surround the individual addresses. Note, however, that sendmail
places only a single address on each E line. There can be multiple E lines. Eachis
processed in turn.
Each line is fully processed as it is read. That is, the line is scanned for multiple addresses.
Eachaddress that is found is alias-expanded. Eachresulting new address is processed by
rule sets 3 and 0 to resolve a delivery agent for each.
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