is there an old cisco pix firewall, or any other firewall with packet 
inspection involved?


Sent from my iPad

> On 22. sep. 2016, at 06.24, Joseph Thibeault <> wrote:
> We use postfix as a mail queue / sending service in one of our applications. 
> This application generates emails with PDF attachments. Some of the emails 
> with PDFs get sent fine, but others seem to cause a "timeout after DATA" 
> error.
> Through reading online, I've seen answers such as adjusting the MTU size on 
> the network interface, etc. None of these solutions have worked. Has anyone 
> had this happen, do you have any suggestions to fix it? 
> Thank you.

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