We are having issues sending emails with attachments over ~2 MB to some
recipients. In the situations were we have an error, the remote server
responds with "421 4.4.2 service timed out. (in reply to end of DATA
command)".
We are not having these issues with all recipients, but there are many
recipients to which we cannot send emails with attachments over ~2 MB. We
can send emails with larger attachments to some recipients (gmail.com and
yahoo.com addresses in particular) with no issues.
Any help is appreciated.
- Rob
# Output of postconf -n
bounce_queue_lifetime = 2h
config_directory = /etc/postfix
debug_peer_list =
local_recipient_maps =
local_transport = error:local mail delivery is disabled
maximal_backoff_time = 20m
maximal_queue_lifetime = 2h
message_size_limit = 104857600
minimal_backoff_time = 10m
mydestination =
mydomain = myhome.com
myhostname = mail.$myorigin
mynetworks = 127.0.0.0/8 10.10.10.0/24 10.10.100.0/24
myorigin = $mydomain
queue_run_delay = 10m
relay_domains = $mydomain myhome.com
relay_recipient_maps = hash:/etc/postfix/relay_recipients
smtpd_delay_reject = yes
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks, reject_non_fqdn_helo_hostname,
reject_invalid_helo_hostname, check_helo_access
pcre:/etc/postfix/helo_access, permit
smtpd_recipient_restrictions = reject_unauth_pipelining,
reject_non_fqdn_recipient, permit_mynetworks, check_client_access
hash:/etc/postfix/recipient_whitelist, check_recipient_access
hash:/etc/postfix/recipient_blacklist, reject_unauth_destination,
reject_rbl_client b.barracudacentral.org, reject_rbl_client
zen.spamhaus.org, reject_rbl_client bl.spamcop.net, reject_rbl_client
zombie.dnsbl.sorbs.net, reject_rbl_client nomail.rhsbl.sorbs.net,
reject_rbl_client bl.blocklist.de, permit
smtpd_sender_restrictions = check_sender_access
pcre:/etc/postfix/sender_blacklist, reject_non_fqdn_sender,
reject_unknown_sender_domain, permit
transport_maps = hash:/etc/postfix/transport
virtual_alias_maps = hash:/etc/postfix/virtual
# Here is the output from tcpdump
No. Time Source Destination
Protocol Length Info
1 2016-11-08 17:32:22.658734 10.10.10.123 DDD.222.3.44
TCP 70 47372 > smtp [SYN] Seq=0 Win=29200 Len=0 MSS=1460
SACK_PERM=1 TSval=2863432 TSecr=0
Frame 1: 70 bytes on wire (560 bits), 70 bytes captured (560 bits)
Ethernet II, Src: RealtekU_bd:b1:11 (52:54:00:bd:b1:11), Dst:
LexCompu_0b:09:35 (4c:02:89:0b:09:35)
Internet Protocol Version 4, Src: 10.10.10.123 (10.10.10.123), Dst:
DDD.222.3.44 (DDD.222.3.44)
Transmission Control Protocol, Src Port: 47372 (47372), Dst Port: smtp (25),
Seq: 0, Len: 0
No. Time Source Destination
Protocol Length Info
2 2016-11-08 17:32:22.697919 DDD.222.3.44 10.10.10.123
TCP 70 smtp > 47372 [SYN, ACK] Seq=0 Ack=1 Win=14480 Len=0 MSS=1460
SACK_PERM=1 TSval=989115275 TSecr=2863432
Frame 2: 70 bytes on wire (560 bits), 70 bytes captured (560 bits)
Ethernet II, Src: Dell_53:eb:0c (00:13:72:53:eb:0c), Dst: RealtekU_bd:b1:11
(52:54:00:bd:b1:11)
Internet Protocol Version 4, Src: DDD.222.3.44 (DDD.222.3.44), Dst:
10.10.10.123 (10.10.10.123)
Transmission Control Protocol, Src Port: smtp (25), Dst Port: 47372 (47372),
Seq: 0, Ack: 1, Len: 0
No. Time Source Destination
Protocol Length Info
3 2016-11-08 17:32:22.698002 10.10.10.123 DDD.222.3.44
TCP 66 47372 > smtp [ACK] Seq=1 Ack=1 Win=29200 Len=0 TSval=2863442
TSecr=989115275
Frame 3: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: RealtekU_bd:b1:11 (52:54:00:bd:b1:11), Dst:
LexCompu_0b:09:35 (4c:02:89:0b:09:35)
Internet Protocol Version 4, Src: 10.10.10.123 (10.10.10.123), Dst:
DDD.222.3.44 (DDD.222.3.44)
Transmission Control Protocol, Src Port: 47372 (47372), Dst Port: smtp (25),
Seq: 1, Ack: 1, Len: 0
No. Time Source Destination
Protocol Length Info
4 2016-11-08 17:32:22.750683 DDD.222.3.44 10.10.10.123
SMTP 167 S: 220 AAA.mailsrvr.com ESMTP - VA Code Section 18.2-152.3:1
forbids sending spam through this system
Frame 4: 167 bytes on wire (1336 bits), 167 bytes captured (1336 bits)
Ethernet II, Src: Dell_53:eb:0c (00:13:72:53:eb:0c), Dst: RealtekU_bd:b1:11
(52:54:00:bd:b1:11)
Internet Protocol Version 4, Src: DDD.222.3.44 (DDD.222.3.44), Dst:
10.10.10.123 (10.10.10.123)
Transmission Control Protocol, Src Port: smtp (25), Dst Port: 47372 (47372),
Seq: 1, Ack: 1, Len: 101
Simple Mail Transfer Protocol
No. Time Source Destination
Protocol Length Info
5 2016-11-08 17:32:22.750735 10.10.10.123 DDD.222.3.44
TCP 66 47372 > smtp [ACK] Seq=1 Ack=102 Win=29200 Len=0
TSval=2863455 TSecr=989115328
Frame 5: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: RealtekU_bd:b1:11 (52:54:00:bd:b1:11), Dst:
LexCompu_0b:09:35 (4c:02:89:0b:09:35)
Internet Protocol Version 4, Src: 10.10.10.123 (10.10.10.123), Dst:
DDD.222.3.44 (DDD.222.3.44)
Transmission Control Protocol, Src Port: 47372 (47372), Dst Port: smtp (25),
Seq: 1, Ack: 102, Len: 0
No. Time Source Destination
Protocol Length Info
6 2016-11-08 17:32:22.750833 10.10.10.123 DDD.222.3.44
SMTP 90 C: EHLO mail.myhome.com
Frame 6: 90 bytes on wire (720 bits), 90 bytes captured (720 bits)
Ethernet II, Src: RealtekU_bd:b1:11 (52:54:00:bd:b1:11), Dst:
LexCompu_0b:09:35 (4c:02:89:0b:09:35)
Internet Protocol Version 4, Src: 10.10.10.123 (10.10.10.123), Dst:
DDD.222.3.44 (DDD.222.3.44)
Transmission Control Protocol, Src Port: 47372 (47372), Dst Port: smtp (25),
Seq: 1, Ack: 102, Len: 24
Simple Mail Transfer Protocol
No. Time Source Destination
Protocol Length Info
7 2016-11-08 17:32:22.751023 DDD.222.3.44 10.10.10.123
TCP 66 smtp > 47372 [ACK] Seq=102 Ack=25 Win=14480 Len=0
TSval=989115329 TSecr=2863455
Frame 7: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: Dell_53:eb:0c (00:13:72:53:eb:0c), Dst: RealtekU_bd:b1:11
(52:54:00:bd:b1:11)
Internet Protocol Version 4, Src: DDD.222.3.44 (DDD.222.3.44), Dst:
10.10.10.123 (10.10.10.123)
Transmission Control Protocol, Src Port: smtp (25), Dst Port: 47372 (47372),
Seq: 102, Ack: 25, Len: 0
No. Time Source Destination
Protocol Length Info
8 2016-11-08 17:32:22.787465 DDD.222.3.44 10.10.10.123
SMTP 154 S: 250 smtp11.gate.ord1a.AAA.com says EHLO to
DDD.DDD.127.100:47372 | 250 SIZE 75000000
Frame 8: 154 bytes on wire (1232 bits), 154 bytes captured (1232 bits)
Ethernet II, Src: Dell_53:eb:0c (00:13:72:53:eb:0c), Dst: RealtekU_bd:b1:11
(52:54:00:bd:b1:11)
Internet Protocol Version 4, Src: DDD.222.3.44 (DDD.222.3.44), Dst:
10.10.10.123 (10.10.10.123)
Transmission Control Protocol, Src Port: smtp (25), Dst Port: 47372 (47372),
Seq: 102, Ack: 25, Len: 88
Simple Mail Transfer Protocol
No. Time Source Destination
Protocol Length Info
9 2016-11-08 17:32:22.787578 10.10.10.123 DDD.222.3.44
SMTP 102 C: MAIL FROM:<j...@myhome.com>
Frame 9: 102 bytes on wire (816 bits), 102 bytes captured (816 bits)
Ethernet II, Src: RealtekU_bd:b1:11 (52:54:00:bd:b1:11), Dst:
LexCompu_0b:09:35 (4c:02:89:0b:09:35)
Internet Protocol Version 4, Src: 10.10.10.123 (10.10.10.123), Dst:
DDD.222.3.44 (DDD.222.3.44)
Transmission Control Protocol, Src Port: 47372 (47372), Dst Port: smtp (25),
Seq: 25, Ack: 190, Len: 36
Simple Mail Transfer Protocol
No. Time Source Destination
Protocol Length Info
10 2016-11-08 17:32:22.826989 DDD.222.3.44 10.10.10.123
TCP 66 smtp > 47372 [ACK] Seq=190 Ack=61 Win=14480 Len=0
TSval=989115405 TSecr=2863464
Frame 10: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: Dell_53:eb:0c (00:13:72:53:eb:0c), Dst: RealtekU_bd:b1:11
(52:54:00:bd:b1:11)
Internet Protocol Version 4, Src: DDD.222.3.44 (DDD.222.3.44), Dst:
10.10.10.123 (10.10.10.123)
Transmission Control Protocol, Src Port: smtp (25), Dst Port: 47372 (47372),
Seq: 190, Ack: 61, Len: 0
No. Time Source Destination
Protocol Length Info
11 2016-11-08 17:32:22.838240 DDD.222.3.44 10.10.10.123
SMTP 80 S: 250 2.1.0 Ok
Frame 11: 80 bytes on wire (640 bits), 80 bytes captured (640 bits)
Ethernet II, Src: Dell_53:eb:0c (00:13:72:53:eb:0c), Dst: RealtekU_bd:b1:11
(52:54:00:bd:b1:11)
Internet Protocol Version 4, Src: DDD.222.3.44 (DDD.222.3.44), Dst:
10.10.10.123 (10.10.10.123)
Transmission Control Protocol, Src Port: smtp (25), Dst Port: 47372 (47372),
Seq: 190, Ack: 61, Len: 14
Simple Mail Transfer Protocol
No. Time Source Destination
Protocol Length Info
12 2016-11-08 17:32:22.838426 10.10.10.123 DDD.222.3.44
SMTP 98 C: RCPT TO:<a...@recip.com>
Frame 12: 98 bytes on wire (784 bits), 98 bytes captured (784 bits)
Ethernet II, Src: RealtekU_bd:b1:11 (52:54:00:bd:b1:11), Dst:
LexCompu_0b:09:35 (4c:02:89:0b:09:35)
Internet Protocol Version 4, Src: 10.10.10.123 (10.10.10.123), Dst:
DDD.222.3.44 (DDD.222.3.44)
Transmission Control Protocol, Src Port: 47372 (47372), Dst Port: smtp (25),
Seq: 61, Ack: 204, Len: 32
Simple Mail Transfer Protocol
No. Time Source Destination
Protocol Length Info
13 2016-11-08 17:32:22.838611 DDD.222.3.44 10.10.10.123
TCP 66 smtp > 47372 [ACK] Seq=204 Ack=93 Win=14480 Len=0
TSval=989115416 TSecr=2863477
Frame 13: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: Dell_53:eb:0c (00:13:72:53:eb:0c), Dst: RealtekU_bd:b1:11
(52:54:00:bd:b1:11)
Internet Protocol Version 4, Src: DDD.222.3.44 (DDD.222.3.44), Dst:
10.10.10.123 (10.10.10.123)
Transmission Control Protocol, Src Port: smtp (25), Dst Port: 47372 (47372),
Seq: 204, Ack: 93, Len: 0
No. Time Source Destination
Protocol Length Info
14 2016-11-08 17:32:22.903910 DDD.222.3.44 10.10.10.123
SMTP 80 S: 250 2.1.5 Ok
Frame 14: 80 bytes on wire (640 bits), 80 bytes captured (640 bits)
Ethernet II, Src: Dell_53:eb:0c (00:13:72:53:eb:0c), Dst: RealtekU_bd:b1:11
(52:54:00:bd:b1:11)
Internet Protocol Version 4, Src: DDD.222.3.44 (DDD.222.3.44), Dst:
10.10.10.123 (10.10.10.123)
Transmission Control Protocol, Src Port: smtp (25), Dst Port: 47372 (47372),
Seq: 204, Ack: 93, Len: 14
Simple Mail Transfer Protocol
No. Time Source Destination
Protocol Length Info
15 2016-11-08 17:32:22.904006 10.10.10.123 DDD.222.3.44
SMTP 72 C: DATA
Frame 15: 72 bytes on wire (576 bits), 72 bytes captured (576 bits)
Ethernet II, Src: RealtekU_bd:b1:11 (52:54:00:bd:b1:11), Dst:
LexCompu_0b:09:35 (4c:02:89:0b:09:35)
Internet Protocol Version 4, Src: 10.10.10.123 (10.10.10.123), Dst:
DDD.222.3.44 (DDD.222.3.44)
Transmission Control Protocol, Src Port: 47372 (47372), Dst Port: smtp (25),
Seq: 93, Ack: 218, Len: 6
Simple Mail Transfer Protocol
No. Time Source Destination
Protocol Length Info
16 2016-11-08 17:32:22.904260 DDD.222.3.44 10.10.10.123
TCP 66 smtp > 47372 [ACK] Seq=218 Ack=99 Win=14480 Len=0
TSval=989115482 TSecr=2863493
Frame 16: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: Dell_53:eb:0c (00:13:72:53:eb:0c), Dst: RealtekU_bd:b1:11
(52:54:00:bd:b1:11)
Internet Protocol Version 4, Src: DDD.222.3.44 (DDD.222.3.44), Dst:
10.10.10.123 (10.10.10.123)
Transmission Control Protocol, Src Port: smtp (25), Dst Port: 47372 (47372),
Seq: 218, Ack: 99, Len: 0
No. Time Source Destination
Protocol Length Info
17 2016-11-08 17:32:22.904841 DDD.222.3.44 10.10.10.123
SMTP 112 S: 354 Start mail input; end with <CRLF>.<CRLF>
Frame 17: 112 bytes on wire (896 bits), 112 bytes captured (896 bits)
Ethernet II, Src: Dell_53:eb:0c (00:13:72:53:eb:0c), Dst: RealtekU_bd:b1:11
(52:54:00:bd:b1:11)
Internet Protocol Version 4, Src: DDD.222.3.44 (DDD.222.3.44), Dst:
10.10.10.123 (10.10.10.123)
Transmission Control Protocol, Src Port: smtp (25), Dst Port: 47372 (47372),
Seq: 218, Ack: 99, Len: 46
Simple Mail Transfer Protocol
No. Time Source Destination
Protocol Length Info
18 2016-11-08 17:32:22.905030 10.10.10.123 DDD.222.3.44
SMTP 2962 C: DATA fragment, 2896 bytes
Frame 18: 2962 bytes on wire (23696 bits), 2962 bytes captured (23696 bits)
Ethernet II, Src: RealtekU_bd:b1:11 (52:54:00:bd:b1:11), Dst:
LexCompu_0b:09:35 (4c:02:89:0b:09:35)
Internet Protocol Version 4, Src: 10.10.10.123 (10.10.10.123), Dst:
DDD.222.3.44 (DDD.222.3.44)
Transmission Control Protocol, Src Port: 47372 (47372), Dst Port: smtp (25),
Seq: 99, Ack: 264, Len: 2896
Simple Mail Transfer Protocol
*** More DATA transfers and acknowledgements... ***
No. Time Source Destination
Protocol Length Info
1746 2016-11-08 17:32:23.321438 10.10.10.123 DDD.222.3.44
SMTP 7306 [TCP Window Full] C: DATA fragment, 7240 bytes
Frame 1746: 7306 bytes on wire (58448 bits), 7306 bytes captured (58448
bits)
Ethernet II, Src: RealtekU_bd:b1:11 (52:54:00:bd:b1:11), Dst:
LexCompu_0b:09:35 (4c:02:89:0b:09:35)
Internet Protocol Version 4, Src: 10.10.10.123 (10.10.10.123), Dst:
DDD.222.3.44 (DDD.222.3.44)
Transmission Control Protocol, Src Port: 47372 (47372), Dst Port: smtp (25),
Seq: 6062427, Ack: 264, Len: 7240
Simple Mail Transfer Protocol
No. Time Source Destination
Protocol Length Info
1747 2016-11-08 17:32:23.321806 DDD.222.3.44 10.10.10.123
TCP 66 smtp > 47372 [ACK] Seq=264 Ack=6069667 Win=10136 Len=0
TSval=989115899 TSecr=2863598
Frame 1747: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: Dell_53:eb:0c (00:13:72:53:eb:0c), Dst: RealtekU_bd:b1:11
(52:54:00:bd:b1:11)
Internet Protocol Version 4, Src: DDD.222.3.44 (DDD.222.3.44), Dst:
10.10.10.123 (10.10.10.123)
Transmission Control Protocol, Src Port: smtp (25), Dst Port: 47372 (47372),
Seq: 264, Ack: 6069667, Len: 0
No. Time Source Destination
Protocol Length Info
1748 2016-11-08 17:32:23.321812 10.10.10.123 DDD.222.3.44
IMF 1616 from: John Doe <j...@myhome.com>, subject: Paperwork for
Jane Smith,
Frame 1748: 1616 bytes on wire (12928 bits), 1616 bytes captured (12928
bits)
Ethernet II, Src: RealtekU_bd:b1:11 (52:54:00:bd:b1:11), Dst:
LexCompu_0b:09:35 (4c:02:89:0b:09:35)
Internet Protocol Version 4, Src: 10.10.10.123 (10.10.10.123), Dst:
DDD.222.3.44 (DDD.222.3.44)
Transmission Control Protocol, Src Port: 47372 (47372), Dst Port: smtp (25),
Seq: 6069667, Ack: 264, Len: 1550
Simple Mail Transfer Protocol
Internet Message Format
No. Time Source Destination
Protocol Length Info
1749 2016-11-08 17:32:23.322316 DDD.222.3.44 10.10.10.123
TCP 66 smtp > 47372 [ACK] Seq=264 Ack=6071217 Win=13032 Len=0
TSval=989115900 TSecr=2863598
Frame 1749: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: Dell_53:eb:0c (00:13:72:53:eb:0c), Dst: RealtekU_bd:b1:11
(52:54:00:bd:b1:11)
Internet Protocol Version 4, Src: DDD.222.3.44 (DDD.222.3.44), Dst:
10.10.10.123 (10.10.10.123)
Transmission Control Protocol, Src Port: smtp (25), Dst Port: 47372 (47372),
Seq: 264, Ack: 6071217, Len: 0
No. Time Source Destination
Protocol Length Info
1750 2016-11-08 17:32:23.323985 DDD.222.3.44 10.10.10.123
TCP 66 [TCP Window Update] smtp > 47372 [ACK] Seq=264 Ack=6071217
Win=28960 Len=0 TSval=989115902 TSecr=2863598
Frame 1750: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: Dell_53:eb:0c (00:13:72:53:eb:0c), Dst: RealtekU_bd:b1:11
(52:54:00:bd:b1:11)
Internet Protocol Version 4, Src: DDD.222.3.44 (DDD.222.3.44), Dst:
10.10.10.123 (10.10.10.123)
Transmission Control Protocol, Src Port: smtp (25), Dst Port: 47372 (47372),
Seq: 264, Ack: 6071217, Len: 0
No. Time Source Destination
Protocol Length Info
1751 2016-11-08 17:33:31.836000 DDD.222.3.44 10.10.10.123
SMTP 96 S: 421 4.4.2 service timed out.
Frame 1751: 96 bytes on wire (768 bits), 96 bytes captured (768 bits)
Ethernet II, Src: Dell_53:eb:0c (00:13:72:53:eb:0c), Dst: RealtekU_bd:b1:11
(52:54:00:bd:b1:11)
Internet Protocol Version 4, Src: DDD.222.3.44 (DDD.222.3.44), Dst:
10.10.10.123 (10.10.10.123)
Transmission Control Protocol, Src Port: smtp (25), Dst Port: 47372 (47372),
Seq: 264, Ack: 6071217, Len: 30
Simple Mail Transfer Protocol
No. Time Source Destination
Protocol Length Info
1752 2016-11-08 17:33:31.836076 DDD.222.3.44 10.10.10.123
TCP 66 smtp > 47372 [FIN, ACK] Seq=294 Ack=6071217 Win=41992 Len=0
TSval=989184415 TSecr=2863598
Frame 1752: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: Dell_53:eb:0c (00:13:72:53:eb:0c), Dst: RealtekU_bd:b1:11
(52:54:00:bd:b1:11)
Internet Protocol Version 4, Src: DDD.222.3.44 (DDD.222.3.44), Dst:
10.10.10.123 (10.10.10.123)
Transmission Control Protocol, Src Port: smtp (25), Dst Port: 47372 (47372),
Seq: 294, Ack: 6071217, Len: 0
No. Time Source Destination
Protocol Length Info
1753 2016-11-08 17:33:31.867374 10.10.10.123 DDD.222.3.44
SMTP 72 C: QUIT
Frame 1753: 72 bytes on wire (576 bits), 72 bytes captured (576 bits)
Ethernet II, Src: RealtekU_bd:b1:11 (52:54:00:bd:b1:11), Dst:
LexCompu_0b:09:35 (4c:02:89:0b:09:35)
Internet Protocol Version 4, Src: 10.10.10.123 (10.10.10.123), Dst:
DDD.222.3.44 (DDD.222.3.44)
Transmission Control Protocol, Src Port: 47372 (47372), Dst Port: smtp (25),
Seq: 6071217, Ack: 295, Len: 6
Simple Mail Transfer Protocol
No. Time Source Destination
Protocol Length Info
1754 2016-11-08 17:33:31.867416 10.10.10.123 DDD.222.3.44
TCP 66 47372 > smtp [FIN, ACK] Seq=6071223 Ack=295 Win=29200 Len=0
TSval=2880734 TSecr=989184415
Frame 1754: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: RealtekU_bd:b1:11 (52:54:00:bd:b1:11), Dst:
LexCompu_0b:09:35 (4c:02:89:0b:09:35)
Internet Protocol Version 4, Src: 10.10.10.123 (10.10.10.123), Dst:
DDD.222.3.44 (DDD.222.3.44)
Transmission Control Protocol, Src Port: 47372 (47372), Dst Port: smtp (25),
Seq: 6071223, Ack: 295, Len: 0
No. Time Source Destination
Protocol Length Info
1755 2016-11-08 17:33:31.867634 DDD.222.3.44 10.10.10.123
TCP 66 smtp > 47372 [ACK] Seq=295 Ack=6071223 Win=41992 Len=0
TSval=989184446 TSecr=2880734
Frame 1755: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: Dell_53:eb:0c (00:13:72:53:eb:0c), Dst: RealtekU_bd:b1:11
(52:54:00:bd:b1:11)
Internet Protocol Version 4, Src: DDD.222.3.44 (DDD.222.3.44), Dst:
10.10.10.123 (10.10.10.123)
Transmission Control Protocol, Src Port: smtp (25), Dst Port: 47372 (47372),
Seq: 295, Ack: 6071223, Len: 0
No. Time Source Destination
Protocol Length Info
1756 2016-11-08 17:33:31.867649 DDD.222.3.44 10.10.10.123
TCP 66 smtp > 47372 [ACK] Seq=295 Ack=6071224 Win=41992 Len=0
TSval=989184446 TSecr=2880734
Frame 1756: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: Dell_53:eb:0c (00:13:72:53:eb:0c), Dst: RealtekU_bd:b1:11
(52:54:00:bd:b1:11)
Internet Protocol Version 4, Src: DDD.222.3.44 (DDD.222.3.44), Dst:
10.10.10.123 (10.10.10.123)
Transmission Control Protocol, Src Port: smtp (25), Dst Port: 47372 (47372),
Seq: 295, Ack: 6071224, Len: 0
--
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