... про такие вот сообщения в maillog:
sendmail<8077>: PAA08077: collect: premature EOM:Broken pipe
sendmail<8077>: PAA08077: SYSERR(root): collect: I/O error on connection from <w.x.y.z.>, from=<user@mydomain.ru>:
Broken pipe
sendmail<8077>: PAA08077: 0: fl=0x0, mode=20666: CHR: size=0
sendmail<8077>: PAA08077: 1: fl=0x2, mode=140777: SOCK mail.mydomain.ru/25->(Transport endpoint is not connected)
sendmail<8077>: PAA08077: 2: fl=0x1, mode=20666: CHR: size=0
sendmail<8077>: PAA08077: 3: fl=0x2, mode=140777: SOCK localhost-><[UNIX: /dev/log>]
sendmail<8077>: PAA08077: 4: fl=0x2, mode=140777: SOCK mail.mydomain.ru/25->(Transport endpoint is not connected)
sendmail<8077>: PAA08077: 5: fl=0x2, mode=140777: SOCK mail.mydomain.ru/25->(Transport endpoint is not connected)
sendmail<8077>: PAA08077: 6: fl=0x1, mode=100600: size=0
sendmail<8077>: PAA08077: 7: fl=0x0, mode=100644: size=16384
sendmail<8077>: PAA08077: 8: fl=0x0, mode=100644: size=16384
sendmail<8077>: PAA08077: 9: fl=0x401, mode=100600: size=138
sendmail<8077>: PAA08077: from=<user@mydomain.ru>, size=21185, class=0, pri=0, nrcpts=1, proto=SMTP, relay=<w.x.y.z>
------------------------------
sendmail.org:
Most likely, the system to which you were connected closed its socket
permaturely (and unexpectedly).
Since sendmail received an unexpected error on writing to a file
descriptor, it dumped file descriper info in syslog messages.
Unless this is a frequent problem, there is no need for concern.
-NWR