If the address is an alias, it shows all the addresses that result from the alias expansion.
If the address is local, it shows the result of aliasing through a user??™s ~/.forward file. If
needexpnhelo is specified, sendmail requires that the requesting site first introduce itself with
an SMTP HELO or EHLO command. If the requesting site has not done so, sendmail
responds with the following message rather than providing the requested expansion
information:
503 5.0.0 I demand that you introduce yourself first
24.9.86.6 PrivacyOptions=needmailhelo
The SMTP protocol specifies that the sending site should issue the HELO or EHLO command
to identify itself before specifying the name of the sender with the MAIL From: command. By
listing needmailhelo withth e PrivacyOptions option, you cause the following error to be
returned to the sending site in this situation:
503 5.0.0 Polite people say HELO first
If needmailhelo is not specified but authwarnings is specified, the following header is added
to the message describing the problem:
X-Authentication-Warning: ourself: Host they didn't use HELO protocol
24.9.86.7 PrivacyOptions=needvrfyhelo
The SMTP VRFY command causes sendmail to verify that an address is that of a local user
or local alias. Unlike EXPN, VRFY does not cause mailing-list contents, the result of aliasing,
or the contents of ~/.
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