I was wondering if anyone would share their thoughts on RFC 1123 section 5.2.2. It states:
The domain names that a Sender-SMTP sends in MAIL and RCPT commands MUST have been "canonicalized," i.e., they must be fully-qualified principal names or domain literals, not nicknames or domain abbreviations. A canonicalized name either identifies a host directly or is an MX name; it cannot be a CNAME. Does anyone know the reasoning behind this guideline? It seems like it is widely ignored. Are there any benefits to following this guideline? Or pitfalls for not following it? Will some receiving servers have trouble finding the MX record if the MAIL FROM domain has a CNAME? Is this even worth worrying about? Would love to hear any thoughts. Luke
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