Verification Mail does not arrive at one destination address

Hello everyone,

I have added a set of @gmail.com addresses as Destination addresses to use in routing rules. This worked perfectly fine, except for one address which does not receive the verification mail. This is still the case when i explicitly re-send the verification mail.

From looking at the community page here, it seems like the address may be suppressed?
The email in question is:
jonas<dot>consultkg<at>gmail<dot>com

Potentially, I added it as destination address shortly before the account was created at google. Maybe this caused the problem