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"RFC 2821 - Simple Mail Transfer Protocol"
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Obsoletes: 821, 974, 1869
3.6 Domains
Only resolvable, fully-qualified, domain names (FQDNs) are permitted
when domain names are used in SMTP. In other words, names that can
be resolved to MX RRs or A RRs (as discussed in section 5) are
permitted, as are CNAME RRs whose targets can be resolved, in turn,
to MX or A RRs. Local nicknames or unqualified names MUST NOT be
used. There are two exceptions to the rule requiring FQDNs:
- The domain name given in the EHLO command MUST BE either a primary
host name (a domain name that resolves to an A RR) or, if the host
has no name, an address literal as described in section 4.1.1.1.
3.8.2 Received Lines in Gatewaying
When forwarding a message into or out of the Internet environment, a
gateway MUST prepend a Received: line, but it MUST NOT alter in any
way a Received: line that is already in the header.
Курсивы мои, ПРОПИСЬ стандартная по "RFC 2119 - Key words for use in RFCs"
[/more] Что же я прочёл неправильно?
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в других программах это легко изменятьЧто именно "это" и в каких именно "других программах"? [more=Желательно]с версиями программ; также приветствуется ссылка на онлайн хелп либо скриншот офлайн хелпа с указанием на такую возможность[/more]