I have a user who is having trouble getting emails from a couple people. When sending emails directly to and from the outside user everything works fine. However, when the outside user tries to forward an email or send an email with PDFs attachments they either are very delayed or get bounced back to the user.
Mailflow analyzer comes back clean.
The outside user has been added to our whitelists.
Thank you for your help ahead of time!
Here is one of the NDR messages the outside user has received.
Diagnostic informationfor administrators:
Generating server:*
*
#< #4.4.2 X-Proprietary; lost connection with*[****] while sending message body> #SMTP#
Original message headers:
Return-Path: <*
Received: from 127.0.0.1 (* [127.0.0.1])
by *(Proprietary) with SMTP id *
for <*; Thu, 15 Oct 2015 14:22:16 -0500 (CDT)
Received: from *(unknown [*])
(using TLSv1 with cipher AES128-SHA (128/128 bits))
(No client certificate requested)
by *...
<<< #4.4.2 X-Proprietary; lost connection with*[****] while sending message body>