'25-starttls' => 'STARTTLS (port 25)',
'587-starttls' => 'STARTTLS / submission (port 587)',
'465-tls' => 'SMTPS (SSL) (port 465)',
'25-starttls' => 'STARTTLS (port 25)',
'587-starttls' => 'STARTTLS / submission (port 587)',
'465-tls' => 'SMTPS (SSL) (port 465)',