| Trace delivery | Debug command-line switch | The -d11.1 (a.k.a. -d11 ) debugging switch is used to trace message delivery. It must be run with the -v command-line switch, or no output will be produced. First, for each delivery agent the following is printed: openmailer: argv Here, argv is the A= array for the delivery agent, with macros expanded and printed. Second, the status of remote hosts is cached internally. Before connecting to a remote host, sendmail checks its cache to see whether that host is down. If it is, it skips connecting to that host. If the -d11.1 debugging switch is also specified, the status of the down host is printed as: openmailer: output of mci_dump( ) here The output of mci_dump( ) looks like this: MCI@ memaddr : flags= mci_flags < flag , flag ,...>, errno= mci_errno , herrno= mci_herrno , exitstat= mci_exitstat , state= mci_state , pid= mci_pid , maxsize= mci_maxsize , phase= mci_phase , mailer= mci_mailer , status= mci_status , rstatus= mci+rstatus , host= mci_host , lastuse= mci_lastuse The meaning of each mci_ item in this output is described in Table 16-8. Table 16-8. The meaning of the MCI structure items | Name | What prints | | memaddr | The address in memory of this C-language structure | | mci_flags | The flag bits in hexadecimal (see Table 16-9) | | mci_errno | The error number of the last connection | | mci_herrno | The DNS h_errno of the last lookup | | mci_exitstat | The < sysexits.h > exit status of the last connection | | mci_state | The current SMTP state | | mci_maxsize | The maximum size message the host will accept | | mci_pid | The PID of the child process | | mci_phase | SMTP phase (string) such as "client greeting" (or NULL) | | mci_mailer | The (text) name of the delivery agent (or NULL) | | mci_status | The DSN status to be added to the address (or NULL) | | mci_rstatus | The SMTP status to be added to the address (or NULL) | | mci_host | The host's name (or NULL) | | mci_lastuse | Last usage time in ctime (3) format | Table 16-9 shows what the individual flag bits in mci_flags mean, and the human-readable flags text that corresponds to each bit. Those text items are shown with the leading source MCIF_ prefix removed. Table 16-9. The meaning of mci_flags hexadecimal values | Name printed | Hex value | Meaning | | VALID | 0x00000001 | This entry is valid | | TEMP | 0x00000002 | Don't cache this connection (prior to V8.12) | | CACHED | 0x00000004 | This connection is currently in open cache | | ESMTP | 0x00000008 | This host speaks ESMTP | | EXPN | 0x00000010 | EXPN command supported | | SIZE | 0x00000020 | SIZE option supported | | 8BITMIME | 0x00000040 | BODY=8BITMIME supported | | 7BIT | 0x00000080 | Strip this message to 7 bits | | MULTSTAT | 0x00000100 | MAIL11V3: handles MULT status (prior to V8.12) | | INHEADER | 0x00000200 | Currently outputting header | | CVT8TO7 | 0x00000400 | Convert from 8 to 7 bits | | DSN | 0x00000800 | DSN extension supported | | 8BITOK | 0x00001000 | OK to send 8-bit characters | | CVT7TO8 | 0x00002000 | Convert from 7 to 8 bits | | INMIME | 0x00004000 | Currently reading MIME header | | AUTH | 0x00008000 | ESMTP AUTH= is supported (V8.10 and above) | | AUTHACT | 0x00010000 | SASL (AUTH) is active (V8.10 and above) | | ENHSTAT | 0x00020000 | ENHANCEDSTATUSCODES SMTP extension supported (V8.10 and above) | | PIPELINED | 0x00040000 | PIPELINING SMTP extension supported (V8.12 and above) | | TLS | 0x00100000 | STARTTLS SMTP extension supported (V8.12 and above) | | TLSACT | 0x00200000 | STARTTLS is active (V8.12 and above) | | DLVR_BY | 0x00400000 | DELIVERBY SMTP extension supported (V8.12 and above) | | HELO | 0x00800000 | Sending sendmail used HELO, so ignore extensions (V8.12 and above) | | ONLY_EHLO | 0x10000000 | Use only EHLO when establishing a connection (V8.12 and above) | After checking to see whether the host is down, sendmail attempts to connect to it for network SMTP mail. If that connect fails, the -d11.1 debugging switch causes the following to be printed: openmailer: makeconnection => stat= exitstatus , errno= errno Here, exitstatus is a numerical representation of the reason for the failure, as documented in <sysexits.h >, and errno is the system-level reason for the error, as documented in <errno.h >. Other errors, such as failure to establish a pipe (2), or failure to fork (2), cause the following to be printed: openmailer: NULL This message (although it contains no information) signals that a more descriptive error message was logged with syslog (3) (Section 14.3). | 
