Knowledgebase

451 Remote connection lost - psmtp
Issue451 Remote connection lost - psmtp Symptoms What does it mean when Postini's servers...

451 Remote connection lost - psmtp
Issues451 Remote connection lost - psmtp SymptomsWhat does it mean when Postini's servers...

451 STARTTLS is required for this sender - psmtp
ISSUE: An inbound message is deferred with the following error code: 451 STARTTLS...

552 Message too large - psmtp
ISSUE: Sender getting the following error 552 Message too large - psmtp POSSIBLE...

554 Cannot relay journal - psmtp
ISSUE Microsoft Exchange is configured to forward archived mail to the custom archive...

554 Too many hops - psmtp
IssueLoop in mail delivery. Symptoms Notifications, Alerts, and Message Center...

Delay when making DNS MX Record changes
IssueWhy is there a delay when making DNS MX record changes?  Resolution DNS record...

Delayed, duplicate or bounced messages from a Postini server
ISSUE A sender receives a failure or warning message from Postini server similar to the...

Delays receiving traffic from MessageLabs MTAs
IssuePostini customers may experience occasional and intermittent delays receiving mail routed...

Deleting an Outbound Server Entry from Postini
Deleting an Outbound Server EntryIf you change IP address ranges, or begin using a new mail...

Explanation of Sender ID
What is sender ID Filtering? RESOLUTION:  The Sender ID Framework is a protocol...

How to build Content based rules to filter Email
You can create Content Manager rules to filter incoming or outgoing mail based on a text string...

Imail 451 Can't connect to domain.com - psmtp
IssueMail delivery to an IMail server is slow or sender reports a number of "451 Can't...

Message delivery was delayed up to 30 minutes
IssueWhy was the delivery of a message through Postini delayed for between 1 and 30...

Outbound: Message deferred - "File write error - psmtp"
ISSUE Outbound messages are delayed with the following 400-series SMTP deferral: "452...

Outbound: Messages bounce with 500-series psmtp errors
Symptom Outbound messages are bounced with one of the following errors: "550 MX record...

Outgoing messages bounced with 554 No relaying allowed - psmtp
Issue Outgoing emails from your mail server are rejected by Postini with the error: 554 No...

Postini Facts and Figures
Official Postini Document The following Facts and Figures are updated once monthly by...

Postini IP Ranges
Postini IP Range The following are the IP ranges for the email protection service systems. Note,...

Postini Message Analyzer
Postini's Email Security solution inserts custom tags into the message headers of processed...

Postini Realtime Filter Status Dashboard
Postini Realtime Filter Status Dashboard...

Signs that an email was delivered from the Message Center
How can it be determined if a message was delivered from an end-user's Message Center...

Using Postini With SpamAssassin - A Case Study
Using Postini With SpamAssassin - A Case Study 13th June 2006 DISCLAIMER: This...

What are the file size limits for attachments?
For Attachment Manager, the message size filter’s maximum limit is 300 MB. The default is...