Make sure both clients are mIRC 6.12 and try again but it is a known issue with DCC and firewalls:
The mIRC thread:
Coming soon! Ideal for large-scale A/V applications, ATEN's VM3200 Modular Matrix Switch is an all-in-one solution that simplifies video wall integration. Easily customize display layouts to see what you want, how you want it in 4k.
First let me state that this website is top notch. I thoroughly enjoy the community that is shared here; those seeking help and those willing to sacrifice their time to help. It is fantastic.
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This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online.
The email signature template has been downloaded from: