SMTP
- port: 25/tcp
Connect
CRLF
SMTP servers often expect CRLF line endings, so use
^V^M
(Ctrl-V Ctrl-M) to enter carriage returns in the terminal; note that^V
does not get echoed.
VRFY Username Enumeration
Related:userenum See SecLists for username wordlists.
EXPN User and Mailing List Enumeration
Verify whether jacob
is a mailbox / jacob
is a valid user:
List all members of the users
mailing list / check whether users
mailing list exists:
The -
indicates that it’s not the last line.