can anyone shed any light on this problem please?
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May 13 09:15:33 mail sendmail[7768]: STARTTLS=server, relay=external.system.com [x.x.x.x], version=TLSv1/SSLv3, verify=FAIL, cipher=AES128-SHA, bits=128/128
May 13 09:16:01 mail sendmail[7768]: o4D8FMgf007768: from=<x@external.system.com>, size=190701, class=0, nrcpts=1, msgid=<17478658.560841273738453870.JavaMail.Joe@external.system.com>, proto=ESMTP, daemon=MTA, relay=external.system.com [x.x.x.x]
May 13 09:16:02 mail sendmail[7888]: o4D8FMgf007768: SYSERR(root): timeout writing message to mail.ourdomain.com: Broken pipe
May 13 09:16:02 mail sendmail[7888]: o4D8FMgf007768: 0: fl=0x0, mode=20666: CHR: dev=0/13, ino=2045, nlink=1, u/gid=0/0, size=0
May 13 09:16:02 mail sendmail[7888]: o4D8FMgf007768: 1: fl=0x1, mode=20666: CHR: dev=0/13, ino=2045, nlink=1, u/gid=0/0, size=0
May 13 09:16:02 mail sendmail[7888]: o4D8FMgf007768: 2: fl=0x1, mode=20666: CHR: dev=0/13, ino=2045, nlink=1, u/gid=0/0, size=0
May 13 09:16:02 mail sendmail[7888]: o4D8FMgf007768: 3: fl=0x2, mode=140777: SOCK localhost->[[UNIX: /dev/log]]
May 13 09:16:02 mail sendmail[7888]: o4D8FMgf007768: 4: fl=0x2, mode=100600: dev=253/2, ino=672337, nlink=1, u/gid=0/51, size=1176
May 13 09:16:02 mail sendmail[7888]: o4D8FMgf007768: 5: fl=0x2, mode=140777: SOCK localhost->[[UNIX: /var/run/clamav/clamav-milter.sock]]
May 13 09:16:02 mail sendmail[7888]: o4D8FMgf007768: 6: fl=0x2, mode=140777: SOCK localhost.localdomain/44309->localhost.localdomain/5757
May 13 09:16:02 mail sendmail[7888]: o4D8FMgf007768: 7: fl=0x0, mode=100600: dev=253/2, ino=672331, nlink=1, u/gid=0/51, size=190036
May 13 09:16:02 mail sendmail[7888]: o4D8FMgf007768: 8: fl=0x8000, mode=100640: dev=8/2, ino=835009, nlink=1, u/gid=0/0, size=12288
May 13 09:16:02 mail sendmail[7888]: o4D8FMgf007768: 9: fl=0x8000, mode=100640: dev=8/2, ino=835009, nlink=1, u/gid=0/0, size=12288
May 13 09:16:02 mail sendmail[7888]: o4D8FMgf007768: 11: fl=0x801, mode=10600: FIFO: dev=0/7, ino=171933070, nlink=1, u/gid=0/51, size=0
May 13 09:16:02 mail sendmail[7888]: o4D8FMgf007768: 12: fl=0x800, mode=10600: FIFO: dev=0/7, ino=171933071, nlink=1, u/gid=0/51, size=0
May 13 09:16:02 mail sendmail[7888]: o4D8FMgf007768: 13: fl=0x8000, mode=100640: dev=8/2, ino=1488048, nlink=1, u/gid=0/0, size=28672
May 13 09:16:02 mail sendmail[7888]: o4D8FMgf007768: 14: fl=0x8000, mode=100640: dev=8/2, ino=1488048, nlink=1, u/gid=0/0, size=28672
May 13 09:16:02 mail sendmail[7888]: o4D8FMgf007768: MCI@0x0: NULL
May 13 09:16:02 mail sendmail[7888]: o4D8FMgf007768: MCI@0x0: NULL
May 13 09:16:02 mail sendmail[7888]: o4D8FMgf007768: smtpquit: mailer scalix_mime exited with exit value 99
May 13 09:16:02 mail sendmail[7888]: o4D8FMgf007768: to=<addressY@ourdomain.com>, delay=00:00:13, xdelay=00:00:01, mailer=scalix_mime, pri=310701, relay=mail, dsn=4.0.0, stat=Deferred
May 13 09:35:32 mail sendmail[9670]: o4D8FMgf007768: SYSERR(root): timeout writing message to mail.ourdomain.com: Broken pipe
May 13 09:35:32 mail sendmail[9670]: o4D8FMgf007768: 0: fl=0x0, mode=20666: CHR: dev=0/13, ino=2045, nlink=1, u/gid=0/0, size=0
May 13 09:35:32 mail sendmail[9670]: o4D8FMgf007768: 1: fl=0x1, mode=20666: CHR: dev=0/13, ino=2045, nlink=1, u/gid=0/0, size=0
May 13 09:35:32 mail sendmail[9670]: o4D8FMgf007768: 2: fl=0x1, mode=20666: CHR: dev=0/13, ino=2045, nlink=1, u/gid=0/0, size=0
May 13 09:35:32 mail sendmail[9670]: o4D8FMgf007768: 3: fl=0x2, mode=140777: SOCK localhost->[[UNIX: /dev/log]]
May 13 09:35:32 mail sendmail[9670]: o4D8FMgf007768: 4: fl=0x2, mode=100600: dev=253/2, ino=672335, nlink=1, u/gid=0/51, size=1309
May 13 09:35:32 mail sendmail[9670]: o4D8FMgf007768: 5: fl=0x2, mode=140777: SOCK localhost.localdomain/45286->localhost.localdomain/5757
May 13 09:35:32 mail sendmail[9670]: o4D8FMgf007768: 6: fl=0x0, mode=100600: dev=253/2, ino=672331, nlink=1, u/gid=0/51, size=190036
May 13 09:35:32 mail sendmail[9670]: o4D8FMgf007768: 7: fl=0x8000, mode=100640: dev=8/2, ino=835009, nlink=1, u/gid=0/0, size=12288
May 13 09:35:32 mail sendmail[9670]: o4D8FMgf007768: 8: fl=0x8000, mode=100640: dev=8/2, ino=835009, nlink=1, u/gid=0/0, size=12288
May 13 09:35:32 mail sendmail[9670]: o4D8FMgf007768: 10: fl=0x801, mode=10600: FIFO: dev=0/7, ino=171955569, nlink=1, u/gid=0/51, size=0
May 13 09:35:32 mail sendmail[9670]: o4D8FMgf007768: 11: fl=0x800, mode=10600: FIFO: dev=0/7, ino=171955570, nlink=1, u/gid=0/51, size=0
May 13 09:35:32 mail sendmail[9670]: o4D8FMgf007768: 12: fl=0x8000, mode=100640: dev=8/2, ino=1488048, nlink=1, u/gid=0/0, size=28672
May 13 09:35:32 mail sendmail[9670]: o4D8FMgf007768: 13: fl=0x8000, mode=100640: dev=8/2, ino=1488048, nlink=1, u/gid=0/0, size=28672
May 13 09:35:32 mail sendmail[9670]: o4D8FMgf007768: MCI@0x0: NULL
May 13 09:35:32 mail sendmail[9670]: o4D8FMgf007768: MCI@0x0: NULL
May 13 09:35:32 mail sendmail[9670]: o4D8FMgf007768: smtpquit: mailer scalix_mime exited with exit value 99
May 13 09:35:32 mail sendmail[9670]: o4D8FMgf007768: to=<addressY@ourdomain.com>, delay=00:19:43, xdelay=00:00:00, mailer=scalix_mime, pri=400701, relay=mail, dsn=4.0.0, stat=Deferred
May 13 10:05:21 mail sendmail[12380]: o4D8FMgf007768: SYSERR(root): timeout writing message to mail.ourdomain.com: Broken pipe
May 13 10:05:21 mail sendmail[12380]: o4D8FMgf007768: 0: fl=0x0, mode=10600: FIFO: dev=0/7, ino=171996997, nlink=1, u/gid=0/0, size=0
May 13 10:05:21 mail sendmail[12380]: o4D8FMgf007768: 1: fl=0x1, mode=10600: FIFO: dev=0/7, ino=171996996, nlink=1, u/gid=0/0, size=0
May 13 10:05:21 mail sendmail[12380]: o4D8FMgf007768: 2: fl=0x1, mode=10600: FIFO: dev=0/7, ino=171996996, nlink=1, u/gid=0/0, size=0
May 13 10:05:21 mail sendmail[12380]: o4D8FMgf007768: 3: fl=0x2, mode=100600: dev=253/2, ino=672336, nlink=1, u/gid=0/51, size=1309
May 13 10:05:21 mail sendmail[12380]: o4D8FMgf007768: 4: fl=0x2, mode=140777: SOCK localhost.localdomain/46861->localhost.localdomain/5757
May 13 10:05:21 mail sendmail[12380]: o4D8FMgf007768: 5: fl=0x0, mode=100600: dev=253/2, ino=672331, nlink=1, u/gid=0/51, size=190036
May 13 10:05:21 mail sendmail[12380]: o4D8FMgf007768: 6: fl=0x8000, mode=100640: dev=8/2, ino=835009, nlink=1, u/gid=0/0, size=12288
May 13 10:05:21 mail sendmail[12380]: o4D8FMgf007768: 7: fl=0x8000, mode=100640: dev=8/2, ino=835009, nlink=1, u/gid=0/0, size=12288
May 13 10:05:21 mail sendmail[12380]: o4D8FMgf007768: 8: fl=0x2, mode=140777: SOCK localhost->[[UNIX: /dev/log]]
May 13 10:05:21 mail sendmail[12380]: o4D8FMgf007768: 9: fl=0x801, mode=10600: FIFO: dev=0/7, ino=171997021, nlink=1, u/gid=0/0, size=0
May 13 10:05:21 mail sendmail[12380]: o4D8FMgf007768: 10: fl=0x800, mode=10600: FIFO: dev=0/7, ino=171997022, nlink=1, u/gid=0/0, size=0
May 13 10:05:21 mail sendmail[12380]: o4D8FMgf007768: 11: fl=0x8000, mode=100640: dev=8/2, ino=1488048, nlink=1, u/gid=0/0, size=28672
May 13 10:05:21 mail sendmail[12380]: o4D8FMgf007768: 12: fl=0x8000, mode=100640: dev=8/2, ino=1488048, nlink=1, u/gid=0/0, size=28672
May 13 10:05:21 mail sendmail[12380]: o4D8FMgf007768: MCI@0x0: NULL
May 13 10:05:21 mail sendmail[12380]: o4D8FMgf007768: MCI@0x0: NULL
May 13 10:05:21 mail sendmail[12380]: o4D8FMgf007768: smtpquit: mailer scalix_mime exited with exit value 99
May 13 10:05:21 mail sendmail[12380]: o4D8FMgf007768: to=<addressY@ourdomain.com>, delay=00:49:32, xdelay=00:00:01, mailer=scalix_mime, pri=490701, relay=mail, dsn=4.0.0, stat=Deferred
It seems to just happen with this single address. Once today, and twice in September. Many emails go to this address without issue.
I searched the Scalix man pages and found no mention of scalix_mime or 99 (in context of being an error code).