Workflow Mailer Configuration SSL - signing method changed SHA1 to SHA256 still do keytool -genkey -

Workflow Mailer Configuration SSL - signing method changed SHA1 to SHA256 still do keytool -genkey -alias -keystore -storetype JKS?

Certificate SHA1 signed was only valid until 2FEB and we dont have Password of existing keystore, so  need to make new keystore,
basing myself on Workflow Mailer Configuration SSL  Doc ID 1324799.1), created new keystore jks ,

Question : should this be rsa or something else as signing of keys is now SHA256 and not SHA1 anymore on MS Exchange 2010 Server?
Question: Is my storekey and cerficate correct , once I see
OK The Microsoft Exchange IMAP4 service is ready, CAPABILTY text ?
Question: Test with $AFJVAPRG fails with BYE Connection , any suggestion? Rem: login with openssl imapserver works