your friendly neighborhood deliverability guide since 2001
What of SRV?
So, SRV records help you publish data for your domain, helping for easy (or auto) configuration of an email client for using mail at that domain. Should I implement SRV records for my domain? Is it widely used by MUAs or mobile devices like iPhones and Android Phones? Is it a security risk to tell people where my IMAP/POP3 servers live? What do you think?