slow smtp issue/packet capture

I am trying to diagnose a slow email issue from various office scanners that
can perform scan to email from their control panel, used to work fine now
their is an intermittent situation where scan a page once, goes fine, rescan
it again and it may take minutes or hours. local email server. I have a
packet capture, but I just noticed there doesn't seem to be a way to attach
it.

I see
sections where
a previous segment loss message from is sent from scanner.
then an awk from email server
then some packets of message body (varies from 3 to 7)
then duplicate awk packets equal in quanity to the number of message body
packet sent.
then a single fast retransimission of message body from scanner is sent to
email server
then more packets without any issues, then then the whole set of messages
above again.

.