We have an in house application that sends an email notification, by way of SMTP, to an internal recipient. We have discovered that some computers with the application will timeout when sending the email. We have determined that the computers with the issue are connected to particular switches that the other computers are not.
I have seen some examples of how to modify the ACL to allow/deny SMTP that make sense. However, I am not very familiar with the Cisco NOS and do not want to bring down the network or leave an unnecessary security hole. My goal is to allow SMTP traffic on certain ports without otherwise altering the existing configuration. The switches involved are the Cisco 2960 and 3560.
Could some one tell me the specific commands I would use to allow SMTP on a specific port without otherwise changing the existing configuration? Any help would be greatly appreciated and would say us a service call.
Thank you very much in advance,