Outlook 2016 disable certificate checking

Question

I have a Gmail account that i managed from Windows Live Mail without any problem. Now i use Outlook 2016 but every time i open it, it informs me that Gmail's certificate can't be verified. I found many answers in web for other versions but none for 2016. I create a registry key,as somebody suggested (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Outlook\Security SupressNameChecks=1) but still nothing. Any idea please ?

Answer 1

In case nobody has found an answer to this yet:

The correct Registry key name is SuppressNameChecks. That's TWO p characters in Suppress.

Spent an hour in frustration pulling my hair out wondering why this setting wasn't working until I decided to, just in case, try using a different spelling than what the internet is telling me. Et voila, certificate errors - gone.

Answer 2

See this page for information about Outlook 2016 / Office 365 Certificate Error Handling.

Key: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\AutoDiscover
Value: ShowCertErrors
Default: 0
Data: 1 = Show certificate warnings/errors; 0 = Don't show certificate warnings

Answer 3

Strangely, I had the opposite - two 'p's did not solve the issue, but one 'p' did. I left both keys in there in case different sections of code use different keys. I was getting the error right at startup, but then again every half hour or so (not every time mail was syncing)

Answer 4

I have several domains hosted on Bluehost and this nag was becoming a real nuisance. I tried all of the methods stated on several channels, none of which worked. I looked at the certificate and made a note of the server for which the certificate was issued and changed my server settings in outlook to match. Tried sending and receiving to make sure they were valid, and bingo. No more nags.