
We recommend that you set up TLS compliance to secure the connection to third-party archiving solutions.
#Email archiver review archive
We recommend configuring the third-party archive to reject messages that aren’t Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM) signed.

If the SMTP host returns a permanent error (5xx), Gmail does not try to resend the message. If a message isn’t successfully delivered to the journal address and the Simple Mail Transfer Protocol (SMTP) host returns a temporary error (4xx), Gmail tries to resend the messages for 8 days. To journal for a particular user, the user must be registered. Journals aren’t sent for messages received for unrecognized recipients. Although some internal recipients may not actually get the message due to content compliance or other policies, delivery to some or all recipients is captured. Internal messages- Internal recipients will remain on the message.Outbound messages-The copy sent by the sender is journaled. Most mail services support automatic email archiving to some extent, typically requiring users to create detailed filters that are hard to manage.To determine whether multiple recipients received the same message, the archiving solution should use deduplication logic. Inbound messages-A separate journal copy with the relevant message version is sent corresponding to each recipient.Sometimes when a message is sent to multiple recipients, one group can receive a different version of the messages due to compliance or routing policies. Outbound messages-If an outbound message is sent to admin quarantines, a journal copy is sent when the user clicks Send, irrespective of whether the message is quarantined.If a quarantined message is denied, the user never sees the message and therefore it’s not archived. Inbound messages-If an inbound message is sent to admin quarantines, the journal copy isn’t sent until the message is released from the quarantine.

Messages that are sent to admin quarantines

For example, if a content compliance policy triggers and strips the attachment, the journal copy won’t have the attachment.
