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Email Response Codes
Requesting Bulk Email Limit Increase
Bulk sending is designed for users who need it for business-critical purposes, e.g. Recruitment consultants emailing individuals applying for a specific job(s), support users needing…
Learn More554 5.7.1: Relay Access Denied
Why do I keep getting a 554 5.7.1: Relay access denied? Situation: Your outbound mail is rejected with a Relay access denied mail response. Solution: Check…
Learn MoreSpambrella 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…
Learn MoreProofpoint 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…
Learn MoreInbound 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…
Learn MoreBounceback 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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