Scott D. Pham:
> Well I took a look at the FAQS, as someone directed me to it. And I
> change my mtu ip discovery path to disable it and it didn't seem to
> solve the problem.

You DID NOT disable IP path MTU discovery. The tcpdump info below
shows that both sender and receiver have IP path MTU discovery
enabled, as evidenced by the (DF) flags in the output below.

However, turning off IP path MTU discovery on your SMTP server is
not going to make a difference, because in the logging below, the
big packets are sent by the SMTP client.

        Wietse

> TCPDUMP Logs
> ===============================
> 12:58:01.334452 trail.inflow.com.1600 >
> web1.arrayex.com.smtp: S 369914780:369914780(0) win 8192 <mss 1460> (DF)
> 12:58:01.334534 web1.arrayex.com.smtp > trail.inflow.com.1600: S
> 4264961360:4264961360(0) ack 369914781 win 30660 <mss 1460> (DF)
> 12:58:01.334722 trail.inflow.com.1600 > web1.arrayex.com.smtp: . ack 1
> win 0
> 12:58:01.386109 trail.inflow.com.1600 > web1.arrayex.com.smtp: . ack 1
> win 8760 (DF)
> 12:58:01.485067 web1.arrayex.com.smtp > trail.inflow.com.1600: P
> 1:81(80) ack 1 win 32120 (DF)
> 12:58:01.544215 trail.inflow.com.1600 > web1.arrayex.com.smtp: P
> 1:44(43) ack 81 win 8680 (DF)
> 12:58:01.544278 web1.arrayex.com.smtp > trail.inflow.com.1600: . ack 44
> win 32077 (DF)
> 12:58:01.544812 web1.arrayex.com.smtp > trail.inflow.com.1600: P
> 81:161(80) ack 44 win 32120 (DF)
> 12:58:01.605909 trail.inflow.com.1600 > web1.arrayex.com.smtp: P
> 44:102(58) ack 161 win 8600 (DF)
> 12:58:01.620029 web1.arrayex.com.smtp > trail.inflow.com.1600: . ack 102
> win 32120 (DF)
> 12:58:01.653332 web1.arrayex.com.smtp > trail.inflow.com.1600: P
> 161:231(70) ack 102 win 32120 (DF)
> 12:58:01.895739 trail.inflow.com.1600 > web1.arrayex.com.smtp: P
> 102:134(32) ack 231 win 8530 (DF)
> 12:58:01.910040 web1.arrayex.com.smtp > trail.inflow.com.1600: . ack 134
> win 32120 (DF)
> 12:58:01.912239 web1.arrayex.com.smtp > trail.inflow.com.1600: P
> 231:280(49) ack 134 win 32120 (DF)
> 12:58:01.964867 trail.inflow.com.1600 > web1.arrayex.com.smtp: P
> 134:140(6) ack 280 win 8481 (DF)
> 12:58:01.965675 web1.arrayex.com.smtp > trail.inflow.com.1600: P
> 280:330(50) ack 140 win 32120 (DF)
> 12:58:02.018481 trail.inflow.com.1600 > web1.arrayex.com.smtp: P
> 140:1164(1024) ack 330 win 8431 (DF)
> 12:58:02.070020 web1.arrayex.com.smtp > trail.inflow.com.1600: . ack
> 1164 win 32120 (DF)
> 12:58:02.123374 trail.inflow.com.1600 > web1.arrayex.com.smtp: P
> 1164:2192(1028) ack 330 win 8431 (DF)
> 12:58:02.260018 web1.arrayex.com.smtp > trail.inflow.com.1600: . ack
> 2192 win 32120 (DF)
> 12:58:03.330122 trail.inflow.com.1600 > web1.arrayex.com.smtp: P
> 2192:2197(5) ack 330 win 8431 (DF)
> 12:58:04.424451 trail.inflow.com.1600 > web1.arrayex.com.smtp: P
> 2192:2197(5) ack 330 win 8431 (DF)
> 12:58:06.611161 trail.inflow.com.1600 > web1.arrayex.com.smtp: P
> 2192:2197(5) ack 330 win 8431 (DF)
> 12:58:10.987752 trail.inflow.com.1600 > web1.arrayex.com.smtp: P
> 2192:2197(5) ack 330 win 8431 (DF)
> 12:58:19.735458 trail.inflow.com.1600 > web1.arrayex.com.smtp: P
> 2192:2197(5) ack 330 win 8431 (DF)
> 12:58:37.235251 trail.inflow.com.1600 > web1.arrayex.com.smtp: P
> 2192:2197(5) ack 330 win 8431 (DF)

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