There have been several incidents of fraudulent e-mails sent to parishioners from a gmail account saying it is Father William asking you to do him a favor and answer back.
The message looks convincing. Please know that the request is fraudulent: Do not respond or follow the directions in such e-mails.
When in doubt, call the Parish Office to verify any calls or requests made on behalf of St. John Vianney or Fr. William. 925-939-7911, ext 0.