There are a number of message classes that can be processed by Exclaimer when applying Server-Side signatures to emails.
Please see the list below:
Exclaimer - Signatures for Microsoft 365
Supported Classes - Signature Applied
| Message Class | Details |
|---|---|
| IPM.Note | E-mail messages |
| IPM.Task | Tasks |
| IPM.TaskRequest | Task requests |
| IPM.TaskRequest.Accept | Responses to accept task requests |
| IPM.TaskRequest.Decline | Responses to decline task requests |
| IPM.TaskRequest.Update | Updates to requested tasks |
| IPM.Outlook.Recall | Recalling sent messages from recipient Inboxes |
NOTE: The maximum email size limit Exclaimer accepts for a Server-Side signature is 150MB for users on Pro plans, and 30mb for users on Standard or Starter plans.
Supported Classes - No Signature Applied
The following message classes are supported by Exclaimer - Signatures for Microsoft 365 but will not have a signature applied. By design, these types of emails cannot be modified after they’ve been sent and will bypass processing when received by Exclaimer’s servers:
| Message Class | Details |
|---|---|
| IPM.Note.Secure | Encrypted emails to other people |
| IPM.Note.Secure.Sign | Digitally signed emails to other people |
| IRM Protected Emails | Emails protected using Information Rights Management |
Unsupported Classes
The following message classes are not supported by Exclaimer - Signatures for Microsoft 365. By default, the Identify messages to send to Exclaimer transport rule will not pass these message classes to Exclaimer for processing:
| Message Class | Details |
|---|---|
| IPM.Appointment | Appointments |
| IPM.Schedule.Meeting.Canceled | Meeting cancellations |
| IPM.Schedule.Meeting.Request | Meeting requests |
| IPM.Schedule.Meeting.Resp.Neg | Responses to decline meeting requests |
| IPM.Schedule.Meeting.Resp.Pos | Responses to accept meeting requests |
| IPM.Schedule.Meeting.Resp.Tent | Responses to tentatively accept meeting requests |
Exclaimer - Signatures for Google Workspace
Supported Classes
| Message Type | Signature is applied in transit (Server-Side signature rules) |
Signature is applied in Gmail (Client-Side signature rules) |
|---|---|---|
| Calendar | Y | N |
| Send As | Y | N |
| Voting Request | Y | N |
| Voting Response | N | N |
| Read Receipts | Y | N |
| Recalling | N/A | N/A |
| Encryption | N | Y |
NOTE: The maximum email size limit Exclaimer accepts for a Server-Side signature is 150MB for users on Pro plans, and 30mb for users on Standard or Starter plans.