Recent versions of Thunderbird, Netscape, and Microsoft??™s Outlook have this support, as do many other such
programs. On laptops that run Unix (such as Linux and FreeBSD), you can, of course, run sendmail.
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5.1 Support SMTP AUTH | 195
in the class $=w (is a local hostname or address), the envelope sender is allowed to
relay. But if the ${auth_type} macro??™s value is empty (nothing was authenticated), or
if the authentication was by an untrusted mechanism, such as PLAIN, the envelope
sender is not allowed to relay.
5.1.5 AUTH Running As a Client
For V8.10 and V8.11, the default authorization information for the local machine
acting as a client is contained in the file /etc/mail/default-auth-info. Beginning with
V8.12, that information is contained in the access database, unless you tell sendmail
otherwise by declaring the authinfo feature (?§17.8.6 on page 616):
FEATURE(`authinfo??) ?†? V8.12 and later
The file or database, if present, must live in a safe directory and must be given secure
permissions. It contains the information needed to authenticate a client (outbound)
connection, and its contents are described in detail in ?§24.9.30 on page 999. Note
that the DefaultAuthInfo option is deprecated as of V8.
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