Что могут означать такие записи в maillog ?

Sendmail8.9.3, открыты только 25 и 110 порты.
Раньше таких записей не было (серверу 3 года):

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]