I do not receive notification mails

Hi,

I get the following smtp.logs:
R=dnslookup defer (-1): lowest numbered MX record points to local host
retry timeout exceeded
SMTP error from remote mail server after initial connection: host deadmail.fw-notify.net [93.189.156.232]: 421 Too many concurrent SMTP connections; please try again later. 
do-not-reply@fw-notify.net R=dnslookup T=remote_smtp defer (0): SMTP error from remote mail server after initial connection: host deadmail.fw-notify.net [93.189.156.232]: 421 Too many concurrent SMTP connections.

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