I also got this letter and installed StartTLS now. On my mailserver (hMailServer) there is also no PFS option - but I think it's not necessary. They write in the letter that PFS is only necessary if you use SSL/TLS instead of StartTLS.
I also got this letter and installed StartTLS now. On my mailserver (hMailServer) there is also no PFS option - but I think it's not necessary. They write in the letter that PFS is only necessary if you use SSL/TLS instead of StartTLS.