The Bitcoin development team's mailing list has been temporarily shut down by Google

On April 3rd, according to Bitcoin developer Ruben Somsen, the Bitcoin developer mailing list (bitcoindev mailing list) is currently inaccessible.
The Google Groups system shows that the mailing list is flagged as containing email spam, malicious software or other malicious content. Somsen said that to its knowledge, no inappropriate content has been found to be posted, and the mailing list is being manually reviewed and the problem is expected to be resolved.