A sender was a circuit in a 20th century electromechanical telephone exchange which sent telephone numbers and other information to another exchange. In some American exchange designs, for example 1XB switch the same term was also used to refer to the circuit that received this information. A telephone operator manually connecting calls with patch cables at a telephone switchboard. ... The Number One Crossbar Switching System was the primary urban local telephone exchange design used by the Bell System in the middle 20th century. ...
Category: Telephony A source is one of the basic concepts of communication and information processing. ... The Director System was introduced to six cities in the UK from 1922 following the introduction of the automatic telephone exchange in the UK in 1912. ... The Panel telephone switch was an early type of automatic telephone exchange, first put into service in the 1920s. ...
If these people use SPF to specify their legitimate senders, the number of error messages may be reduced because receivers implementing SPF will know that the message is forged.
In particular, if a sender provides SPF information, and the receiver uses it, the receiver has some justification in believing that the email at least came from the domain that it asserts it came from.
One solution is for the SPF record to specify the forwarder as an allowed sender, but this is problematic because the sender has no idea in general what aliases the receiver might have configured.
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