IP connection error

[undertake]

Hi all!

First post 

I need your help. I do have same trouble receiving mail.

We have a fortiAnalyzer and see the following logging: 

In the first row we revived mail en the next row the Fortigate denied the connection. 

In the next two posts I will add the details from row one and two. 

Configuration: We have a VIP (port 25) rule from wan1 to internal vlan servers. 

How is this possible? 

Thanks

[undertake]

Hello,

I found my solution. I was able to make a packet capture and found corrupt packages. 

The WAN interface had a bad MTU size. 

Greetz,

Undertake,

[Esam]

try with this command :

#config log memory filter #set severity information #end