_imap._tcp         3600  SRV  10 5 143 imap.emailpro.ch.
_imaps._tcp        3600  SRV  20 5 993 imap.emailpro.ch.
_submission._tcp   3600  SRV  10 5 587 smtp.emailpro.ch.
_submissions._tcp  3600  SRV  20 5 465 smtp.emailpro.ch.