554 5.7.1: Relay access denied

Why do I keep getting a 554 5.7.1: Relay access denied? Spambrella is a closed relay system. This means that all mail going through the…

Email Delivery Error Codes

Common Email Delivery Error Codes Delivery summary: Any time you see, “This message was rejected by its destination for reasons outside the control of Spambrella,…

Spambrella reports – “550 User email address is marked as invalid”

The Spambrella MTA’s will give a 550 user invalid response to inbound email sent to a recipient address that has been marked as Invalid by the SMTP Discovery…

Proofpoint Dynamic Reputation (PDR) listings and removal

Spambrella utilizes a block list service named: Proofpoint Dynamic Reputation, or PDR. Spambrella utilizes PDR for inbound email. IPs listed on PDR will block a message…

Inbound Email: Not receiving emails from particular senders or sending domains.

If Spambrella users are unable to receive email from certain email addresses, it is most likely an issue with the sending mail server. However there are…

Bounceback received on outbound relay. SMTP error message: “delivery temporarily suspended: connect to [XXX.XXX.XXX.XXX]:25: Connection timed out.

The bounceback is required to investigate the logs of the destination SMTP server. Problems of this nature are usually a poor quality SMTP server, a broken…

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