Postfix (Email) articles

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DKIM (DomainKeys Identified Mail) Enable DKIM (Domain Keys Identified Mail) Forwarding Forward emails using /etc/aliases Headers Viewing email headers (TO FROM SUBJECT) Inbound emails Receive external emails Retrieve email using the Terminal Install Install Postfix on Linux LDAP LDAP Logs Logs Mail Queue List emails in mail queue using the postqueue command None Resolve error "Temporary Lookup Failure" when sending Postfix emails nssdb (Network Security Services Database) Append certificates to nssdb (Network Security Services Database) Delete certificates in nssdb (Network Security Services Database) List certificates in nssdb (Network Security Services Database) Ports Configure Postfix to listen on certain ports PowerShell Send email using PowerShell Relay Relay emails through mail.twc.com (Spectrum Time Warner Cable) Relay emails through SendGrid SASL Authentication SASL authentication SpamAssassin Create your own rules for SpamAssassin Flag foreign language email using SpamAssassin Integrate SpamAssassin with Postfix SPF Enable SPF (Sender Policy Framework) SSL Encrypt SMTP traffic using a public/private key pair (SMTPS port 587) Troubleshooting Resolve "5.3.4 message size limit exceeded" Resolve "authentication failed" Resolve "Could not open connection to host, on port 25: Connect failed" Resolve "fatal: request to deliver as mail system owner" Resolve "Host or domain name not found" Resolve "hostname does not resolve to address" Resolve "no shared cipher" Resolve "opendkim-testkey: keys do not match" Resolve "Peer's certificate issuer has been marked as not trusted" Resolve "STARTTLS extension not supported by server" Resolve "Unauthenticated senders not allowed" with SendGrid relay Resolve error "4.7.1 Relay access denied" when sending an email using Mozilla Thunderbird Resolve error "telnet unable to connect to remote host connection refused" Resolve error '454 4.7.1 Relay access denied' when attempting to send a Postfix email Test connection using openssl Users and Groups Create a new user account Create a users email address and inbox