is there an old cisco pix firewall, or any other firewall with packet inspection involved?
Harald Sent from my iPad > On 22. sep. 2016, at 06.24, Joseph Thibeault <j...@dashride.com> 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.
