![]() ![]() Messages must not be transmitted through insecure email relay or proxy servers. ![]() Sender must not open more than 500 simultaneous connections to inbound email servers without making prior arrangements.After multiple non-delivery responses (see #2), the sender must cease further attempts to send email to that recipient.After given a numeric SMTP error response code between 500 and 599 (also known as a permanent non-delivery response), the sender must not attempt to retransmit that message to that recipient.Sender is expected to comply with all technical standards for the transmission of Internet email, as published by The Internet Society's Internet Engineering Task Force (IETF), including RFC 2821, RFC 2822, and others.In addition, email servers connecting to must adhere to the following requirements:
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