Functional group list of channel options

There are a great many channel options available for configuring channel behavior. The channel options may be viewed in an alphabetic list; alternatively, they may also be viewed grouped by functionality  for convenience in considering inter-related options.

In Unified Configuration, channel options are configured directly under the channel name: channel:channel-name.channel-option In legacy configuration, channel options were set as keywords on the channel definition in the MTA configuration file, ; channel options appeared on the first line of a channel definition, after the channel name.

Note that there are also many MTA options  affecting MTA operation in general (rather than affecting specific channels); in general such MTA level options are distinct from channel options (not merely global defaults for channels) as MTA options may alter more fundamental aspects of MTA operation,  but in some cases an MTA level option does establish a default for all channels which may then be overridden via a channel option analogue.

Note also that besides the normal channel options under discussion here, some channels also support some channel-specific options. These are channel-specific options which are only supported and available for that specific type of channel: for historical (and functional) reasons they are implemented differently from the usual channel options. Such channel-specific options were, in legacy configuration, configured in channel option files; in Unified Configuration they are configured under the  channel option: channel:channel-name.options.channel-specific-option-name See the specific type of channel  for a list of that channel&#x27;s  valid channel-specific options.

Channel options listed alphabetically lists channel options alphabetically; Channel options grouped by  functionality below lists channel options by functional group:

 Addresses 

 Attachments and MIME processing 

 BSMTP-specific 

 Character sets and eight bit data 

 Conversion tag and service conversion 

 Display labels 

 DKIM 

 Error interpretation 

 File creation in the MTA queue area </li>

 Gateway/firewall/mailhub/Message Router channel connection </li>

 Headers </li>

 Host names </li>

 Incoming channel matching and switching </li>

 Logging and debugging </li>

 Long address lists or headers </li>

 Message hash </li>

 Message tracking </li>

 MLS </li>

 Notification messages and postmaster messages </li>

 Processing control and job submission </li>

 Sensitivity limits </li>

 Sieve filters and delivery flags </li>

 Size limits on messages </li>

 Spam/virus filter package use </li>

<li> SMTP and LMTP protocol </li>

<li> TCP/IP connections, DNS lookups, and SOCKS connections </li>

<li> TLS and SASL </li>

</ul>

Channel options shown in  are  defaults; channel options marked with + are only supported under OpenVMS.

+Supported only on OpenVMS.

See also:
 * Addresses channel options
 * Attachments and MIME processing channel options
 * BSMTP-specific channel options
 * Character sets and eight bit data channel options
 * Conversion tag and service conversion channel options
 * Display label channel options
 * DKIM channel options
 * Error interpretation channel options
 * File creation in the MTA queue area channel options
 * Gateway or firewall or mailhub channel options
 * Headers channel options
 * Host name channel options
 * Incoming channel match and switch channel options
 * ISC channel options
 * Logging and debugging channel options
 * Long address lists or headers channel options
 * Message hash channel options
 * Message tracking channel options
 * MLS channel options
 * Notification messages and postmaster messages channel options
 * Processing control and job submission channel options
 * Sensitivity limits channel options
 * Sieve filters and delivery flags channel options
 * Size limits on messages channel options
 * Spamfilter channel options
 * SMTP and LMTP protocol channel options
 * TCPIP connections and DNS lookups channel options
 * TLS and SASL channel options
 * Alphabetic list of channel options
 * Channel options
 * Available channels
 * MTA options