SMTP Configuration
The class accepts one or more of the following configuration settings. Configuration settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these internal properties is provided through the Config method.SMTP Configuration Settings
| AllowEmptyTo: If set to True, then the SendTo property is not required.Normally, the SendTo property is required to send a message. If AllowEmptyTo is True, then this is not the case, and messages can be sent with just one or both of Cc and BCc set. | |
AuthorizationIdentity: The value to use as the authorization identity when SASL authentication is used.
When AuthMechanism is set to amXOAUTH2 you may use this setting to specify an authorization
identity to be used when authenticating.
In the case of amXOAUTH2 this should be your OAUTH authorization string. For instance:
Bearer ya29.AHES6ZRmS-8xPbpGetC1VbABJIBRdKm-c4X7wMVGAbgxdGt5q8Ts3QNote: When using amXOAUTH2 User must be specified, but Password is not required. | |
| Charset: When set, the message headers will be encoded using the specified Charset.This property is used to specify the "charset" to be used to encode the message headers. For example, to use UTF-8 you can set this property to "UTF-8". The default value is "" (empty string) in which case the headers will not be encoded. | |
| Hello: The argument for HELO (herald) command to the server (defaults to local host name).The Hello property specifies a string to send to the MailServer at connection time as an
argument to the SMTP HELO command. This generally identifies the host sending mail, and that's
why the Hello property defaults to the name of the local host. The property is provided in case
the class does not accept the default value and a custom value (such as, for example, a fully
qualified domain name) must be sent.
If AllowExtensions is True the EHLO command will be sent instead of the HELO command. | |
| KeepQueue: If set to True, queued files are not deleted after a successful send.Normally, ProcessQueue deletes queued files after processing them. If KeepQueue is True, the file extension is instead changed to ".sent" and the files are not deleted. | |
| MaxHeaderLength: Maximum length for headers to avoid line folding (default 80).
The MaxHeaderLength specifies the maximum line length supported by the mail delivery system. Any
headers longer than MaxHeaderLength are folded as specified in RFC 822.
It is generally a good idea to use a MaxHeaderLength of less than 100 bytes, although different mail relays and mail servers have different requirements for header lengths. | |
| OtherHeaders: An RFC 822 compliant string consisting of extra headers.This is the same as the OtherHeaders property. This setting is exposed here for use by classs that inherit from SMTP. | |
| ReturnPath: Sets the Return-Path to be used for sending email.This is the same as the ReturnPath property. This setting is exposed here for use by classs that inherit from SMTP. | |
| SendRSET: Whether to send RSET command.By default, the class will periodically send the RSET command to the server. Changing this configuration setting to False will prevent the RSET command from being sent. This can be useful when interacting with some servers that do not respond properly to the RSET command. | |
| StopOnToErrors: Instructs the class to stop sending the message if the server does not acknowledge any of the TOs.If this setting is set to True, the class will fail the moment the server does not acknowledge a To address. If set to False, an error will be fired for every To that is not recognized by the server, but the message will be sent to the rest of the recipients. The default value is True. | |
| StopOnCcErrors: Instructs the class to stop sending the message if the server does not acknowledge any of the CCs.If this setting is set to True, the class will fail the moment the server does not acknowledge a Cc address. If set to False, an error will be fired for every Cc that is not recognized by the server, but the message will be sent to the rest of the recipients. The default value is True. | |
| StopOnBccErrors: Instructs the class to stop sending the message if the server does not acknowledge any of the BCCs.If this setting is set to True, the class will fail the moment the server does not acknowledge a Bcc address. If set to False, an error will be fired for every Bcc that is not recognized by the server, but the message will be sent to the rest of the recipients. The default value is False. |
IPPort Configuration Settings
| ConnectionTimeout: Sets a separate timeout value for establishing a connection.When set, this configuration setting allows you to specify a different timeout value for establishing a connection. Otherwise, the class will use Timeout for establishing a connection and transmitting/receiving data. | |||||||||
| FirewallAutoDetect: Tells the class whether or not to automatically detect and use firewall system settings, if available.This is the same as FirewallAutoDetect. This setting is provided for use by classs that do not directly expose Firewall properties. | |||||||||
| FirewallHost: Name or IP address of firewall (optional).If a FirewallHost is given, requested connections will be authenticated through the specified firewall
when connecting.
If the FirewallHost setting is set to a Domain Name, a DNS request is initiated. Upon successful termination of the request, the FirewallHost setting is set to the corresponding address. If the search is not successful, an error is returned. NOTE: This is the same as FirewallHost. This setting is provided for use by classs that do not directly expose Firewall properties. | |||||||||
| FirewallPassword: Password to be used if authentication is to be used when connecting through the firewall.If FirewallHost is specified, the FirewallUser and FirewallPassword settings
are used to connect and authenticate to the given firewall. If the authentication fails, the class fails with an error.
NOTE: This is the same as FirewallPassword. This setting is provided for use by classs that do not directly expose Firewall properties. | |||||||||
| FirewallPort: The TCP port for the FirewallHost;.Note that the FirewallPort is set automatically when FirewallType is set to a valid value.
NOTE: This is the same as FirewallPort. This setting is provided for use by classs that do not directly expose Firewall properties. | |||||||||
FirewallType: Determines the type of firewall to connect through.The appropriate values are as follows:
NOTE: This is the same as FirewallType. This setting is provided for use by classs that do not directly expose Firewall properties. | |||||||||
| FirewallUser: A user name if authentication is to be used connecting through a firewall.If the FirewallHost is specified, the FirewallUser and FirewallPassword
settings are used to connect and authenticate to the Firewall. If the authentication fails, the class fails with an error.
NOTE: This is the same as FirewallUser. This setting is provided for use by classs that do not directly expose Firewall properties. | |||||||||
| KeepAliveTime: The inactivity time in milliseconds before a TCP keep-alive packet is sent.When set, TCPKeepAlive will automatically be set to true.
By default the operating system will determine the
time a connection is idle before a TCP keep-alive packet is sent. This system default if this value is not specified here is 2 hours. In many
cases a shorter interval is more useful. Set this value to the desired interval in milliseconds.
Note: This value is not applicable in Java. | |||||||||
| KeepAliveInterval: The retry interval, in milliseconds, to be used when a TCP keep-alive packet is sent and no response is received.When set, TCPKeepAlive will automatically be set to true.
A TCP keep-alive packet will be sent after a period of inactivity as
defined by KeepAliveTime. If no acknowledgement is received from the remote host the keep-alive packet
will be re-sent. This setting specifies the interval at which the successive keep-alive packets are sent in milliseconds.
This system default if this value is not specified here is 1 second.
Note: This value is not applicable in Java or MAC. | |||||||||
| KeepAliveRetryCount: The number of keep-alive packets to be sent before the remotehost is considered disconnected.When set, TCPKeepAlive will automatically be set to true.
A TCP keep-alive packet will be sent after a period of inactivity as
defined by KeepAliveTime. If no acknowledgement is received from the remote host the keep-alive packet
will be re-sent. This setting specifies the number of times that the keep-alive packets will be re-sent before the remote host
is considered disconnected.
The system default if this value is not specified here is 9.
Note: This configuration setting is only available in the Unix platform, and isn't supported in Mac OS or FreeBSD. | |||||||||
| Linger: When set to True, connections are terminated gracefully.This property controls how a connection is closed. The default is True.
In the case that Linger is True (default), there are two scenarios for determining how long the connection will linger. The first, if LingerTime is 0 (default), the system will attempt to send pending data for a connection until the default IP protocol timeout expires. In the second scenario, LingerTime is a positive value, the system will attempt to send pending data until the specified LingerTime is reached. If this attempt fails, then the system will reset the connection. The default behavior (which is also the default mode for stream sockets) might result in a long delay in closing the connection. Although the class returns control immediately, the system could hold system resources until all pending data is sent (even after your application closes). Setting this property to False forces an immediate disconnection. If you know that the other side has received all the data you sent (by a client acknowledgment, for example), setting this property to False might be the appropriate course of action. | |||||||||
| LingerTime: Time in seconds to have the connection linger. LingerTime is the time, in seconds, to leave the socket connection linger. This value is 0 by default, which means it will use the default IP protocol timeout. | |||||||||
| LocalHost: The name of the local host through which connections are initiated or accepted.
The LocalHost setting contains the name of the local host
as obtained by the gethostname() system call, or if the
user has assigned an IP address, the value of that address.
In multi-homed hosts (machines with more than one IP interface) setting LocalHost to the value of an interface will make the class initiate connections (or accept in the case of server classs) only through that interface. If the class is connected, the LocalHost setting shows the IP address of the interface through which the connection is made in internet dotted format (aaa.bbb.ccc.ddd). In most cases, this is the address of the local host, except for multi-homed hosts (machines with more than one IP interface). | |||||||||
| LocalPort: The TCP port in the local host where the class binds.
This must be set before a connection is
attempted. It instructs the class to bind to a specific
port (or communication endpoint) in the local machine.
Setting this to 0 (default) enables the system to choose a port at random. The chosen port will be shown by LocalPort after the connection is established. LocalPort cannot be changed once a connection is made. Any attempt to set this when a connection is active will generate an error. This; setting is useful when trying to connect to services that require a trusted port in the client side. An example is the remote shell (rsh) service in UNIX systems. | |||||||||
| MaxLineLength: The maximum amount of data to accumulate when no EOL is found.MaxLineLength is the size of an internal buffer, which holds received data while waiting for an EOL
string.
If an EOL string is found in the input stream before MaxLineLength bytes are received, the DataIn event is fired with the EOL parameter set to True, and the buffer is reset. If no EOL is found, and MaxLineLength bytes are accumulated in the buffer, the DataIn event is fired with the EOL parameter set to False, and the buffer is reset. The minimum value for MaxLineLength is 256 bytes. The default value is 2048 bytes. The maximum value is 65536 bytes. | |||||||||
| MaxTransferRate: The transfer rate limit in bytes per second.This setting can be used to throttle outbound TCP traffic. Set this to the number of bytes to be sent per second. By default this is not set and there is no limit. | |||||||||
| RecordLength: The length of received data records.If set to a positive value, this setting defines the length of data records to be received. The class will accumulate data
until RecordLength is reached and only then fire the DataIn event with data of length RecordLength.
This allows data to be received as records of known length. This value can be changed at any time, including within the DataIn event.
The default value is 0, meaning this setting is not used. | |||||||||
| TCPKeepAlive: Determines whether or not the keep alive socket option is enabled.If set to true, the socket's keep-alive option is enabled and keep-alive packets will be sent periodically
to maintain the connection. Set KeepAliveTime and KeepAliveInterval to
configure the timing of the keep-alive packets.
Note: This value is not applicable in Java. | |||||||||
UseIPv6: Whether to use IPv6.When set to 0 (default), the class will use IPv4 exclusively.
When set to 1, the class will use IPv6 exclusively. To instruct the class to prefer IPv6 addresses, but use IPv4 if IPv6 is not supported on the system, this setting should be set to 2. The default value is 0.
Possible values are:
| |||||||||
| TcpNoDelay: Whether or not to delay when sending packets.
When true, the socket will send all data that is ready to send at once. When
false, the socket will send smaller buffered packets of data at small intervals.
This is known as the Nagle algorithm.
By default, this config is set to false. |
Socket Configuration Settings
| AbsoluteTimeout: Determines whether timeouts are inactivity timeouts or absolute timeouts.If AbsoluteTimeout is set to True, any method which does not complete within Timeout seconds
will be aborted. By default, AbsoluteTimeout is False, and the timeout is an inactivity timeout.
Note: This option is not valid for UDP ports. | |
| FirewallData: Used to send extra data to the firewall.When the firewall is a tunneling proxy, use this property to send custom (additional) headers to the firewall (e.g. headers for custom authentication schemes). | |
| InBufferSize: The size in bytes of the incoming queue of the socket.
This is the size of an internal queue in the TCP/IP stack.
You can increase or decrease its size depending on the amount
of data that you will be receiving. Increasing the value of the
InBufferSize setting can provide significant improvements in
performance in some cases.
Some TCP/IP implementations do not support variable buffer sizes. If that is the case, when the class is activated the InBufferSize reverts to its defined size. The same happens if you attempt to make it too large or too small. | |
| OutBufferSize: The size in bytes of the outgoing queue of the socket.This is the size of an internal queue in the TCP/IP stack.
You can increase or decrease its size depending on the amount
of data that you will be sending. Increasing the value of the
OutBufferSize setting can provide significant improvements in
performance in some cases.
Some TCP/IP implementations do not support variable buffer sizes. If that is the case, when the class is activated the OutBufferSize reverts to its defined size. The same happens if you attempt to make it too large or too small. |
Base Configuration Settings
| SelectWaitMillis: The length of time in milliseconds the class will wait when DoEvents is called if there are no events to process. If there are no events to process when DoEvents is called, the class will wait for the amount of time specified here before returning. The default value is 20. |
Base Configuration Settings
| CodePage: The system code page used for Unicode to Multibyte translations.
The default code page is the Active Code Page (0).
The following is a list of valid code page identifiers:
|