sendmail, 4th Edition

Masquerading

Masquerading is the process of transforming the local hostname in addresses into that of another domain. This results in the mail message appearing to come from that other domain rather than from the local host. Masquerading is most often used in domains where email is addressed to the domain rather than to individual hosts inside the domain.

Masquerading usually rewrites header-sender addresses. Some mc features allow you also to rewrite envelope addresses and recipient headers. The complete list of all definitions and features that affect masquerading is shown in Table 17-3.

Table 17-3. Definitions and features affecting masquerading

What	§	Version	Masquerade
EXPOSED_USER	EXPOSED_USER mc Macro on page 599	V8.6 and later	All but these hosts
EXPOSED_USER_FILE	EXPOSED_USER_FILE mc macro on page 600	V8.12 and later	All but these
FEATURE(allmasquerade)	FEATURE(allmasquerade) on page 615	V8.2 and later	The recipient too
FEATURE(domaintable)	FEATURE(domaintable) on page 621	V8.2 and later	Rewrite old domain as equivalent to new domain
FEATURE(generics_entire_domain)	FEATURE(generics_entire_domain) on page 622	V8.10 and later	Transform sender addresses
FEATURE(genericstable)	FEATURE(genericstable) on page 622	V8.8 and later	Transform sender addresses
FEATURE(limited_masquerade)	FEATURE(limited_masquerade) on page 625	V8.8 and later	Only MASQUERADE_DOMAIN hosts
FEATURE(local_no_masquerade)	FEATURE(local_no_masquerade) on page 626	V8.12 and later ...