Array
(
    [1-grid-mx01.co.za] => 5
    [1-grid-mx02.com] => 5
    [1-grid-mx03.co.za] => 5
    [1-grid-mx04.com] => 5
    [sportwebdesign.co.za] => 0
)

try 1-grid-mx01.co.za:25

try 1-grid-mx02.com:25

try 1-grid-mx03.co.za:25

try 1-grid-mx04.com:25

try sportwebdesign.co.za:25

Error: Could not connect to a valid mail server for this email address: @sportwebdesign.co.za

Array
(
    [gmail-smtp-in.l.google.com] => 5
    [alt1.gmail-smtp-in.l.google.com] => 10
    [alt2.gmail-smtp-in.l.google.com] => 20
    [alt3.gmail-smtp-in.l.google.com] => 30
    [alt4.gmail-smtp-in.l.google.com] => 40
    [gmail.com] => 0
)

try gmail-smtp-in.l.google.com:25

try alt1.gmail-smtp-in.l.google.com:25

try alt2.gmail-smtp-in.l.google.com:25

try alt3.gmail-smtp-in.l.google.com:25

try alt4.gmail-smtp-in.l.google.com:25

try gmail.com:25

Error: Could not connect to a valid mail server for this email address: @gmail.com