550 5.7.1 We do not relay, account limits apply

Check the account limits for the particular user account, its domain and on the server level.

Default limits:

SMTP sender must be authenticated. SMTP authenticated user must be same as email sender address.

Number of messages: 1000 / day
Maximum message size: 100 MB / message
Maximum recipients: 100 / message

Denied for relaying too often: 50 / hour
Number of connections: 60 / minute
Maximum unknown delivery count: 5 / hour

Blocking time: 30 minutes

Applies To

SMTP

See Also