What are you doing when these appear ?
Normally we see this sort of thing resulting in a malware alert not these
The IP shown in your 1st image is for mail.optonline.net, so the same as your 2nd images domain.
Is this your email service provider ?
If this isn’t your email service provider and or if you weren’t sending email or automatically checking for email then it would be more suspicious.
That would be fine under normal circumstances if it only happened when sending email. But the frequency (seen in the OPs other post) is pretty high. My major concern is the fact it is svchost.exe doing the connecting not the email client.
I’m not actually doing anything when this happens.
But I did set up Windows 10 Mail app. About a month ago.
But I don’t even have the app open when these notification pop up.
Although I suspect it is always running in the background.