DNS record for clients (facultative)
To help clients finding automatically how to configure parameters to use your mail server, you can add specific DNS records.
_submission._tcp.athome.tld 86400 IN SRV 0 1 587 athome.tld _imap._tcp.athome.tld 86400 IN SRV 0 0 0 . _imaps._tcp.athome.tld 86400 IN SRV 0 1 993 athome.tld