Spark Port 25 Blocking

If you can receive mail from our mail servers but cannot send to them, and you are a Spark internet customer, it is highly likely Spark is filtering Port 25 (the port mail is normally sent on) to prevent you doing so.

Please follow the instructions as detailed on Spark's website to have Port Filtering excepted on your account:  https://store.spark.co.nz/forms/s/port25-requests

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