My work's email filter regularly flags links to JIRA and github as dangerous. It stopped being even ironically amusing after a while.

Microsoft's own Outlook.com flags Windows Insider emails coming from a .microsoft.com domain as junk even after marking the domain as "no junk". They know themselves well.

Frequent frustration past week for me:

The integrated button to join a Microsoft Teams meeting directly from my Microsoft Outlook Calendar doesn't work because Microsoft needs to scan the link from Microsoft to Microsoft for malware before proceeding, and the malware scanning service has temporary downtime and serves me static page saying "The content you are accessing cannot currently be verified".

I feel like the GitHub one might be okay since a lot of malware binaries are hosted there still.