'-d13.1'' ''''


Show delivery Debug command-line switch

The -d13.1 (a.k.a. -d13) debugging switch causes sendmail to display information about the recipients of each mail message as it is being delivered. The -d13.1 debugging switch tells sendmail to print the mode of delivery and then the recipient information:

SENDALL: mode dmode, id=qid, e_from output of printaddr( ) here (Section 16.3) 
        e_flags = envelope flags here
output of printaddr( ) here (Section 16.3) 

Here, dmode is one of the delivery modes shown in Table 16-10. The qid is the queue message identifier (such as g7PI04TK027759). The address of the sender (e_from) is dumped by using the printaddr( ) routine. Then the envelope flags (e_flags) are dumped as described in Table 16-6. Next, information about all the recipients (sendqueue:) is printed by using the printaddr( ) routine.

Table 16-10. Delivery modes used by sendall( )




Deliver in background


Defer, queue without DNS lookups


Interactive delivery


Queue, don't deliver


Verify only (used internally)

Finally, the -d13.1 debugging switch causes sendmail to print a message every time it splits an envelope in two:

sendall: split orig into new

Here, orig is the original queue message identifier for the original envelope (such as g7PKuBWE027877) and new is the identifier for the new envelope, the near identical clone of the first. Envelopes need to split if they have different owners.

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