Below are some advanced registry key settings that are not available through the Administration application. Only change these settings if you understand what you are doing.
Caution
HKEY_LOCAL_MACHINE\Software\MailEnable\MailEnable\Connectors\SMTP\
| Registry Key | Default Value | Description |
|---|---|---|
| Disable Inbound Delivery | 0 | Stops mail from being delivered internally. |
| Disable Outbound Delivery | 0 | Stops mail from being delivered externally. |
| Force Inbound Local Resolution | 1 | Checks the local machine for a matching email address. |
| Inbound Force Sender Resolution | 1 | Checks to see if the sender is a valid local email. |
| Inbound Maximum Header Length | 16 | The maximum size (in bytes) that the header can be. |
| Maximum Allowed Received Headers | 100000 | The maximum number of addresses that can be sent to internally. |
| Maximum Inbound Domains | 150 | The maximum number of domains that can be sent to with one email message. |
| Maximum Inbound Recipients | 300 | The maximum number of email addresses a single email message can be sent to. |
| Maximum Outbound Domains | 100 | The number of domains for one message before the message gets split. |
| Maximum Recipients Per Domain | 256 | The maximum number of email addresses a single email message can be sent to for one domain. |
| Outbound MX Server List Limit | 32 | The maximum number of MX records that will be checked by the SMTP connector. |
| Post Send Message Wait | 1 | The time that a message sits in the inbound queue before it is delivered. |