sendmail Cookbook
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EHLO message, STARTTLS and emergency queue clearance emstp mailer, recipient addresses, masquerading ENCR: keyword encryption asymmetric authentication comparison double inbound, requiring levels, access database outbound requiring STARTTLS and private key public key requirements, access database and requiring for specific recipients STARTTLS and TLS_Srv: entry, access database encryption too weak error message Enhanced Mail System Status Codes enhdnsbl, blackhole lists to block spam envelope sender addresses, masquerading 2nd envelopes, maximum, queue and ERROR keyword (access databases), spam blocking and error mailer error messages Alias0 missing map file, correcting encryption too weak routing, sending from mailertable errors OpenSSL files, correcting regex support, correcting Relaying denied correcting virtusertable and User unknown, correcting esmtp mailer, relaying to mail hub /etc/mail directory, permissions, administrator and ETRN command EXPN command EXPOSED_USER macro adding to sendmail configuration all sender addresses disabling local mailer masquerading envelope sender address, masquerading excluding specific hostnames generic.m4 file LDAP masquerading local host aliases, limiting masquerading mail relay hosts , masquerading sender addresses masquerading all hostnames recipient addresses, masquerading Extended SMTP (ESMTP) mailer EXTERNAL authentication external hosts, relaying mail 2nd
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