Options

   Smarthost Authentication

Authentication

This selects the type of authentication required by the smart host you are sending emails to. Leave this as "None" if you do not use authentication to send outbound emails from your usual email clients through your smarthost If you are using a service such as Gmail or Office365 to send email you may need to use OAuth2 authentication, and click the authenticate button to sign in and get an authentication token. These services may change the sender address when used.

Example interface:

Options:None, Plain, Login, NTLM, OAuth2

Default:None

Username

The authentication username required by the smart host you wish to send emails to for the authentication type configured.

Example interface:

Password

The authentication password required by the smart host you wish to send emails to for the authentication type configured.

Example interface:

Authorize ID (if required)

The authentication authorization ID. This is used by the SMTP authentication mechanism PLAIN only, it is ignored for the authentication type LOGIN. For more information on the authentication mechanism PLAIN please refer to your mail server documentation or the relevant RFC

Example interface:

Authenticate

Sets up OAuth authentication for the account. This is only used for accounts such as Google/Gmail and Office365 who support the XOAuth2 authentication system

Example interface:

   Connections and Bandwidth

MaxConnections

You can use a large number of simultaneous connections to provide for large amounts of email traffic being sent. Set this high if there is lots of outgoing mail and your mail server can handle large numbers of connections simultaneously.

Example interface:

Range1 - 64

Default:12

Example:8

TimeOut

If no response is received from a remote server within this time the connection is dropped and retried later

Default:300 seconds

Example:60 seconds

MaxDuration

If an operation is not completed within this time the connection is dropped and retried later

Default:6000 seconds

Example:6000 seconds

MaxSendBandwidth

You can throttle the maximum bandwidth allowed for sending email to other MTAs. Typically you do not need to change this setting.

Example interface:

Range1 - 1000000 kbps

Default:1000000 kbps

Example:64 kbps

MaxRecvBandwidth

You can throttle the maximum bandwidth allowed for sending email to other MTAs. Typically you do not need to change this setting.

Example interface:

Range1 - 1000000 kbps

Default:1000000 kbps

Example:64 kbps

   Mail loop detection

Maximum Hops

The number of Received: headers in the email is checked vs this setting. If it exceeds this configured number of maximum hops (servers through which the email can pass) then the email will be failed with an error. This helps prevent/limit email looping caused my a misconfiguration, for example configuring your smarthost or mailserver to be the same server and port as is running Hexamail (thereby sending email back to itself)

Example interface:

Range24 - 256 hops

Default:40 hops

Example:120 hops

Resend Remove Hops

If the email exceeds the maximum number of hops it can be difficult to resend, This setting will remove all local hops on resending an email, to allow resend of email that has been through your server repeatedly

Example interface:

Options:On/Off

Default:true

   MX Server Security

Use STARTTLS Encryption

Use STARTTLS to encrypt connections whenever the remote MX servers support it. If set to When Available STARTTLS will be used if the remote MX server advertises STARTTLS support. If set to Required then the email will be failed for recipient(s) on the server(s) that do not advertise STARTTLS support in their greeting response to the SMTP EHLO command. NOTE that this is only for servers found using MX DNS lookups, to use TLS for a smarthost or your mailserver please see the relevant setting under thed smarthost or mailserver settings.

Example interface:

Options:Off, When Available, Required

Default:Off

Ignore certificate errors

If an MX server has issues with its SSL certificate (or it mismatches the server) this setting can be used to ignore such errors

Example interface:

Options:On/Off

Default:Off